Algebra Examples

$3 x^{3} - 2 y^{3} - 6 x^{2} y^{2} + x y$ for $x = \frac{2}{3}$ and $y = \frac{1}{2}$

Step 1

Replace the variable $x$ with $\frac{2}{3}$ in the expression.

$3 {(\frac{2}{3})}^{3} - 2 y^{3} - 6 {(\frac{2}{3})}^{2} y^{2} + (\frac{2}{3}) y$

Step 2

Replace the variable $y$ with $\frac{1}{2}$ in the expression.

$3 {(\frac{2}{3})}^{3} - 2 {(\frac{1}{2})}^{3} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3

Simplify each term.

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Step 3.1

Apply the product rule to $\frac{2}{3}$ .

$3 \frac{2^{3}}{3^{3}} - 2 {(\frac{1}{2})}^{3} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.2

Raise $2$ to the power of $3$ .

$3 \frac{8}{3^{3}} - 2 {(\frac{1}{2})}^{3} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.3

Raise $3$ to the power of $3$ .

$3 (\frac{8}{27}) - 2 {(\frac{1}{2})}^{3} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.4

Cancel the common factor of $3$ .

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Step 3.4.1

Factor $3$ out of $27$ .

$3 \frac{8}{3 (9)} - 2 {(\frac{1}{2})}^{3} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.4.2

Cancel the common factor.

$3 \frac{8}{3 \cdot 9} - 2 {(\frac{1}{2})}^{3} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.4.3

Rewrite the expression.

$\frac{8}{9} - 2 {(\frac{1}{2})}^{3} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.5

Apply the product rule to $\frac{1}{2}$ .

$\frac{8}{9} - 2 \frac{1^{3}}{2^{3}} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.6

One to any power is one.

$\frac{8}{9} - 2 \frac{1}{2^{3}} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.7

Raise $2$ to the power of $3$ .

$\frac{8}{9} - 2 (\frac{1}{8}) - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.8

Cancel the common factor of $2$ .

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Step 3.8.1

Factor $2$ out of $- 2$ .

$\frac{8}{9} + 2 (- 1) \frac{1}{8} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.8.2

Factor $2$ out of $8$ .

$\frac{8}{9} + 2 \cdot - 1 \frac{1}{2 \cdot 4} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.8.3

Cancel the common factor.

$\frac{8}{9} + 2 \cdot - 1 \frac{1}{2 \cdot 4} - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.8.4

Rewrite the expression.

$\frac{8}{9} - 1 (\frac{1}{4}) - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.9

Rewrite $- 1 (\frac{1}{4})$ as $- (\frac{1}{4})$ .

$\frac{8}{9} - (\frac{1}{4}) - 6 {(\frac{2}{3})}^{2} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.10

Apply the product rule to $\frac{2}{3}$ .

$\frac{8}{9} - \frac{1}{4} - 6 \frac{2^{2}}{3^{2}} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.11

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

$\frac{8}{9} - \frac{1}{4} - 6 \frac{4}{3^{2}} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.12

Raise $3$ to the power of $2$ .

$\frac{8}{9} - \frac{1}{4} - 6 (\frac{4}{9}) {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.13

Cancel the common factor of $3$ .

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Step 3.13.1

Factor $3$ out of $- 6$ .

$\frac{8}{9} - \frac{1}{4} + 3 (- 2) \frac{4}{9} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.13.2

Factor $3$ out of $9$ .

$\frac{8}{9} - \frac{1}{4} + 3 \cdot - 2 \frac{4}{3 \cdot 3} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.13.3

Cancel the common factor.

$\frac{8}{9} - \frac{1}{4} + 3 \cdot - 2 \frac{4}{3 \cdot 3} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.13.4

Rewrite the expression.

$\frac{8}{9} - \frac{1}{4} - 2 (\frac{4}{3}) {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.14

Combine $- 2$ and $\frac{4}{3}$ .

$\frac{8}{9} - \frac{1}{4} + \frac{- 2 \cdot 4}{3} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.15

Multiply $- 2$ by $4$ .

$\frac{8}{9} - \frac{1}{4} + \frac{- 8}{3} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.16

Move the negative in front of the fraction.

$\frac{8}{9} - \frac{1}{4} - \frac{8}{3} {(\frac{1}{2})}^{2} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.17

Apply the product rule to $\frac{1}{2}$ .

$\frac{8}{9} - \frac{1}{4} - \frac{8}{3} \cdot \frac{1^{2}}{2^{2}} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.18

One to any power is one.

$\frac{8}{9} - \frac{1}{4} - \frac{8}{3} \cdot \frac{1}{2^{2}} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.19

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

$\frac{8}{9} - \frac{1}{4} - \frac{8}{3} \cdot \frac{1}{4} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.20

Cancel the common factor of $4$ .

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Step 3.20.1

Move the leading negative in $- \frac{8}{3}$ into the numerator.

$\frac{8}{9} - \frac{1}{4} + \frac{- 8}{3} \cdot \frac{1}{4} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.20.2

Factor $4$ out of $- 8$ .

$\frac{8}{9} - \frac{1}{4} + \frac{4 (- 2)}{3} \cdot \frac{1}{4} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.20.3

Cancel the common factor.

$\frac{8}{9} - \frac{1}{4} + \frac{4 \cdot - 2}{3} \cdot \frac{1}{4} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.20.4

Rewrite the expression.

$\frac{8}{9} - \frac{1}{4} + \frac{- 2}{3} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.21

Move the negative in front of the fraction.

$\frac{8}{9} - \frac{1}{4} - \frac{2}{3} + (\frac{2}{3}) \cdot (\frac{1}{2})$

Step 3.22

Cancel the common factor of $2$ .

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Step 3.22.1

Cancel the common factor.

$\frac{8}{9} - \frac{1}{4} - \frac{2}{3} + \frac{2}{3} \cdot \frac{1}{2}$

Step 3.22.2

Rewrite the expression.

$\frac{8}{9} - \frac{1}{4} - \frac{2}{3} + \frac{1}{3}$

Step 4

Combine fractions.

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Step 4.1

Combine the numerators over the common denominator.

$\frac{8}{9} + \frac{- 1}{4} + \frac{- 2 + 1}{3}$

Step 4.2

Add $- 2$ and $1$ .

$\frac{8}{9} + \frac{- 1}{4} + \frac{- 1}{3}$

Step 5

Find the common denominator.

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Step 5.1

Multiply $\frac{8}{9}$ by $\frac{4}{4}$ .

$\frac{8}{9} \cdot \frac{4}{4} + \frac{- 1}{4} + \frac{- 1}{3}$

Step 5.2

Multiply $\frac{8}{9}$ by $\frac{4}{4}$ .

$\frac{8 \cdot 4}{9 \cdot 4} + \frac{- 1}{4} + \frac{- 1}{3}$

Step 5.3

Multiply $\frac{- 1}{4}$ by $\frac{9}{9}$ .

$\frac{8 \cdot 4}{9 \cdot 4} + \frac{- 1}{4} \cdot \frac{9}{9} + \frac{- 1}{3}$

Step 5.4

Multiply $\frac{- 1}{4}$ by $\frac{9}{9}$ .

$\frac{8 \cdot 4}{9 \cdot 4} + \frac{- 1 \cdot 9}{4 \cdot 9} + \frac{- 1}{3}$

Step 5.5

Multiply $\frac{- 1}{3}$ by $\frac{12}{12}$ .

$\frac{8 \cdot 4}{9 \cdot 4} + \frac{- 1 \cdot 9}{4 \cdot 9} + \frac{- 1}{3} \cdot \frac{12}{12}$

Step 5.6

Multiply $\frac{- 1}{3}$ by $\frac{12}{12}$ .

$\frac{8 \cdot 4}{9 \cdot 4} + \frac{- 1 \cdot 9}{4 \cdot 9} + \frac{- 1 \cdot 12}{3 \cdot 12}$

Step 5.7

Reorder the factors of $9 \cdot 4$ .

$\frac{8 \cdot 4}{4 \cdot 9} + \frac{- 1 \cdot 9}{4 \cdot 9} + \frac{- 1 \cdot 12}{3 \cdot 12}$

Step 5.8

Multiply $4$ by $9$ .

$\frac{8 \cdot 4}{36} + \frac{- 1 \cdot 9}{4 \cdot 9} + \frac{- 1 \cdot 12}{3 \cdot 12}$

Step 5.9

Multiply $4$ by $9$ .

$\frac{8 \cdot 4}{36} + \frac{- 1 \cdot 9}{36} + \frac{- 1 \cdot 12}{3 \cdot 12}$

Step 5.10

Multiply $3$ by $12$ .

$\frac{8 \cdot 4}{36} + \frac{- 1 \cdot 9}{36} + \frac{- 1 \cdot 12}{36}$

Step 6

Combine the numerators over the common denominator.

$\frac{8 \cdot 4 - 1 \cdot 9 - 1 \cdot 12}{36}$

Step 7

Simplify each term.

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Step 7.1

Multiply $8$ by $4$ .

$\frac{32 - 1 \cdot 9 - 1 \cdot 12}{36}$

Step 7.2

Multiply $- 1$ by $9$ .

$\frac{32 - 9 - 1 \cdot 12}{36}$

Step 7.3

Multiply $- 1$ by $12$ .

$\frac{32 - 9 - 12}{36}$

Step 8

Simplify by subtracting numbers.

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Step 8.1

Subtract $9$ from $32$ .

$\frac{23 - 12}{36}$

Step 8.2

Subtract $12$ from $23$ .

$\frac{11}{36}$

Step 9

The result can be shown in multiple forms.

Exact Form:

$\frac{11}{36}$

Decimal Form:

$0.30\overline{5}$