Calculus Examples

$0 = 1.84 \cdot 10^{- 12} r^{2} - (164) \cdot 8.99 \cdot 10^{9} {(1.6 \cdot 10^{- 19})}^{2} r - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2}$

Step 1

Rewrite the equation as $1.84 \cdot 10^{- 12} r^{2} - 164 \cdot 8.99 \cdot (10^{9} {(1.6 \cdot 10^{- 19})}^{2} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$ .

$1.84 \cdot 10^{- 12} r^{2} - 164 \cdot 8.99 \cdot (10^{9} {(1.6 \cdot 10^{- 19})}^{2} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2

Simplify $1.84 \cdot 10^{- 12} r^{2} - 164 \cdot 8.99 \cdot (10^{9} {(1.6 \cdot 10^{- 19})}^{2} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2}$ .

Tap for more steps...

Step 2.1

Simplify each term.

Tap for more steps...

Step 2.1.1

Multiply $- 164$ by $8.99$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (10^{9} {(1.6 \cdot 10^{- 19})}^{2} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.2

Raise $10$ to the power of $9$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (1000000000 {(1.6 \cdot 10^{- 19})}^{2} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.3

Apply the product rule to $1.6 \cdot 10^{- 19}$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (1000000000 ({1.6}^{2} \cdot {(10^{- 19})}^{2}) r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.4

Raise $1.6$ to the power of $2$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (1000000000 (2.56 \cdot {(10^{- 19})}^{2}) r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.5

Multiply the exponents in ${(10^{- 19})}^{2}$ .

Tap for more steps...

Step 2.1.5.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (1000000000 (2.56 \cdot 10^{- 19 \cdot 2}) r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.5.2

Multiply $- 19$ by $2$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (1000000000 \cdot 2.56 \cdot 10^{- 38} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.6

Multiply $1000000000$ by $2.56$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (2560000000 \cdot 10^{- 38} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.7

Move the decimal point in $2560000000$ to the left by $9$ places and increase the power of $10^{- 38}$ by $9$ .

$1.84 \cdot 10^{- 12} r^{2} - 1474.36 \cdot (2.56 \cdot 10^{- 29} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.8

Multiply $2.56$ by $- 1474.36$ .

$1.84 \cdot 10^{- 12} r^{2} - 3774.3616 (10^{- 29} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.9

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$1.84 \cdot 10^{- 12} r^{2} - 3774.3616 (\frac{1}{10^{29}} r) - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.10

Combine $\frac{1}{10^{29}}$ and $r$ .

$1.84 \cdot 10^{- 12} r^{2} - 3774.3616 \frac{r}{10^{29}} - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.11

Combine $- 3774.3616$ and $\frac{r}{10^{29}}$ .

$1.84 \cdot 10^{- 12} r^{2} + \frac{- 3774.3616 r}{10^{29}} - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.12

Move the negative in front of the fraction.

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 1.84 \cdot 10^{- 12} \cdot {(1.5 \cdot 10^{- 14})}^{2} = 0$

Step 2.1.13

Apply the product rule to $1.5 \cdot 10^{- 14}$ .

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 1.84 \cdot 10^{- 12} \cdot ({1.5}^{2} \cdot {(10^{- 14})}^{2}) = 0$

Step 2.1.14

Raise $1.5$ to the power of $2$ .

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 1.84 \cdot 10^{- 12} \cdot (2.25 \cdot {(10^{- 14})}^{2}) = 0$

Step 2.1.15

Multiply the exponents in ${(10^{- 14})}^{2}$ .

Tap for more steps...

Step 2.1.15.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 1.84 \cdot 10^{- 12} \cdot (2.25 \cdot 10^{- 14 \cdot 2}) = 0$

Step 2.1.15.2

Multiply $- 14$ by $2$ .

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 1.84 \cdot 10^{- 12} \cdot 2.25 \cdot 10^{- 28} = 0$

Step 2.1.16

Multiply $- 1.84$ by $2.25$ .

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 4.14 (10^{- 12} \cdot 10^{- 28}) = 0$

Step 2.1.17

Multiply $10^{- 12}$ by $10^{- 28}$ by adding the exponents.

Tap for more steps...

Step 2.1.17.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 12 - 28} = 0$

Step 2.1.17.2

Subtract $28$ from $- 12$ .

$1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 2.2

Reorder factors in $1.84 \cdot 10^{- 12} r^{2} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40}$ .

$1.84 r^{2} \cdot 10^{- 12} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3

Simplify each term.

Tap for more steps...

Step 3.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$1.84 r^{2} \cdot \frac{1}{10^{12}} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.2

Raise $10$ to the power of $12$ .

$1.84 r^{2} \cdot \frac{1}{1000000000000} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.3

Multiply $1.84 r^{2} \frac{1}{1000000000000}$ .

Tap for more steps...

Step 3.3.1

Combine $1.84$ and $\frac{1}{1000000000000}$ .

$r^{2} \frac{1.84}{1000000000000} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.3.2

Combine $r^{2}$ and $\frac{1.84}{1000000000000}$ .

$\frac{r^{2} \cdot 1.84}{1000000000000} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.4

Move $1.84$ to the left of $r^{2}$ .

$\frac{1.84 \cdot r^{2}}{1000000000000} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.5

Factor $1.84$ out of $1.84 \cdot r^{2}$ .

$\frac{1.84 (r^{2})}{1000000000000} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.6

Factor $1000000000000$ out of $1000000000000$ .

$\frac{1.84 (r^{2})}{1000000000000 (1)} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.7

Separate fractions.

$\frac{1.84}{1000000000000} \cdot \frac{r^{2}}{1} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.8

Divide $1.84$ by $1000000000000$ .

$0 \frac{r^{2}}{1} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 3.9

Divide $r^{2}$ by $1$ .

$0 r^{2} - \frac{3774.3616 r}{10^{29}} - 4.14 \cdot 10^{- 40} = 0$

Step 4

Multiply through by the least common denominator $10^{29}$ , then simplify.

Tap for more steps...

Step 4.1

Apply the distributive property.

$10^{29} (0 r^{2}) + 10^{29} (- \frac{3774.3616 r}{10^{29}}) + 10^{29} \cdot - 4.14 \cdot 10^{- 40} = 0$

Step 4.2

Simplify.

Tap for more steps...

Step 4.2.1

Cancel the common factor of $10^{29}$ .

Tap for more steps...

Step 4.2.1.1

Move the leading negative in $- \frac{3774.3616 r}{10^{29}}$ into the numerator.

$10^{29} \cdot (0 r^{2}) + 10^{29} (\frac{- 3774.3616 r}{10^{29}}) + 10^{29} \cdot - 4.14 \cdot 10^{- 40} = 0$

Step 4.2.1.2

Cancel the common factor.

$10^{29} \cdot (0 r^{2}) + 10^{29} (\frac{- 3774.3616 r}{10^{29}}) + 10^{29} \cdot - 4.14 \cdot 10^{- 40} = 0$

Step 4.2.1.3

Rewrite the expression.

$10^{29} \cdot (0 r^{2}) - 3774.3616 r + 10^{29} \cdot - 4.14 \cdot 10^{- 40} = 0$

Step 4.2.2

Multiply $10^{29}$ by $10^{- 40}$ by adding the exponents.

Tap for more steps...

Step 4.2.2.1

Move $10^{- 40}$ .

$10^{29} \cdot (0 r^{2}) - 3774.3616 r + 10^{- 40} \cdot 10^{29} \cdot - 4.14 = 0$

Step 4.2.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$10^{29} \cdot (0 r^{2}) - 3774.3616 r + 10^{- 40 + 29} \cdot - 4.14 = 0$

Step 4.2.2.3

Add $- 40$ and $29$ .

$10^{29} \cdot (0 r^{2}) - 3774.3616 r + 10^{- 11} \cdot - 4.14 = 0$

Step 4.3

Simplify each term.

Tap for more steps...

Step 4.3.1

Move $0$ to the left of $10^{29}$ .

$0 \cdot 10^{29} r^{2} - 3774.3616 r + 10^{- 11} \cdot - 4.14 = 0$

Step 4.3.2

Move the decimal point in $0$ to the right by $12$ places and decrease the power of $10^{29}$ by $12$ .

$1.84 \cdot 10^{17} r^{2} - 3774.3616 r + 10^{- 11} \cdot - 4.14 = 0$

Step 4.3.3

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$1.84 \cdot 10^{17} r^{2} - 3774.3616 r + \frac{1}{10^{11}} \cdot - 4.14 = 0$

Step 4.3.4

Raise $10$ to the power of $11$ .

$1.84 \cdot 10^{17} r^{2} - 3774.3616 r + \frac{1}{100000000000} \cdot - 4.14 = 0$

Step 4.3.5

Combine $\frac{1}{100000000000}$ and $- 4.14$ .

$1.84 \cdot 10^{17} r^{2} - 3774.3616 r + \frac{- 4.14}{100000000000} = 0$

Step 4.3.6

Divide $- 4.14$ by $100000000000$ .

$1.84 \cdot 10^{17} r^{2} - 3774.3616 r 0 = 0$

Step 5

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 6

Substitute the values $a = 1.84 \cdot 10^{17}$ , $b = - 3774.3616$ , and $c = 0$ into the quadratic formula and solve for $r$ .

$\frac{3774.3616 \pm \sqrt{{(- 3774.3616)}^{2} - 4 \cdot (1.84 \cdot 10^{17} \cdot 0)}}{2 \cdot 1.84 \cdot 10^{17}}$

Step 7

Simplify.

Tap for more steps...

Step 7.1

Convert $0$ to scientific notation.

$r = \frac{3774.3616 \pm \sqrt{{(- 3774.3616)}^{2} - 4 \cdot (1.84 \cdot 10^{17} \cdot - 4.14 \cdot 10^{- 11})}}{2 \cdot 1.84 \cdot 10^{17}}$

Step 7.2

Multiply $1.84$ by $- 4.14$ .

$r = \frac{3774.3616 \pm \sqrt{{(- 3774.3616)}^{2} - 4 \cdot (- 7.6176 (10^{17} \cdot 10^{- 11}))}}{2 \cdot 1.84 \cdot 10^{17}}$

Step 7.3

Multiply $10^{17}$ by $10^{- 11}$ by adding the exponents.

Tap for more steps...

Step 7.3.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$r = \frac{3774.3616 \pm \sqrt{{(- 3774.3616)}^{2} - 4 \cdot (- 7.6176 \cdot 10^{17 - 11})}}{2 \cdot 1.84 \cdot 10^{17}}$

Step 7.3.2

Subtract $11$ from $17$ .

$r = \frac{3774.3616 \pm \sqrt{{(- 3774.3616)}^{2} - 4 \cdot - 7.6176 \cdot 10^{6}}}{2 \cdot 1.84 \cdot 10^{17}}$

Step 7.4

Multiply $- 4$ by $- 7.6176$ .

$r = \frac{3774.3616 \pm \sqrt{{(- 3774.3616)}^{2} + 30.4704 \cdot 10^{6}}}{2 \cdot 1.84 \cdot 10^{17}}$

Step 7.5

Multiply $2$ by $1.84$ .

$r = \frac{3774.3616 \pm \sqrt{{(- 3774.3616)}^{2} + 30.4704 \cdot 10^{6}}}{3.68 \cdot 10^{17}}$

Step 7.6

Simplify the numerator.

Tap for more steps...

Step 7.6.1

Raise $- 3774.3616$ to the power of $2$ .

$r = \frac{3774.3616 \pm \sqrt{14245805.4875546 + 30.4704 \cdot 10^{6}}}{3.68 \cdot 10^{17}}$

Step 7.6.2

Move the decimal point in $30.4704$ to the left by $1$ place and increase the power of $10^{6}$ by $1$ .

$r = \frac{3774.3616 \pm \sqrt{14245805.4875546 + 3.04704 \cdot 10^{7}}}{3.68 \cdot 10^{17}}$

Step 7.6.3

Convert $14245805.4875546$ to scientific notation.

$r = \frac{3774.3616 \pm \sqrt{1.42458054 \cdot 10^{7} + 3.04704 \cdot 10^{7}}}{3.68 \cdot 10^{17}}$

Step 7.6.4

Factor $10^{7}$ out of $1.42458054 \cdot 10^{7} + 3.04704 \cdot 10^{7}$ .

$r = \frac{3774.3616 \pm \sqrt{(1.42458054 + 3.04704) \cdot 10^{7}}}{3.68 \cdot 10^{17}}$

Step 7.6.5

Add $1.42458054$ and $3.04704$ .

$r = \frac{3774.3616 \pm \sqrt{4.47162054 \cdot 10^{7}}}{3.68 \cdot 10^{17}}$

Step 7.6.6

Raise $10$ to the power of $7$ .

$r = \frac{3774.3616 \pm \sqrt{4.47162054 \cdot 10000000}}{3.68 \cdot 10^{17}}$

Step 7.6.7

Multiply $4.47162054$ by $10000000$ .

$r = \frac{3774.3616 \pm \sqrt{44716205.4875546}}{3.68 \cdot 10^{17}}$

Step 7.7

Simplify $\frac{3774.3616 \pm \sqrt{44716205.4875546}}{3.68 \cdot 10^{17}}$ .

$r = \frac{94359.04 \pm 25 \sqrt{44716205.4875546}}{9200000000000000000}$

Step 8

The final answer is the combination of both solutions.

$r = 0, 0$