Calculus Examples

$lim_{x \to 8} \frac{a x^{4}}{d x^{3}} + \frac{b x^{2}}{e x^{2}} + \frac{c}{f x} + \frac{1}{g}$

Step 1

Reduce.

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Step 1.1

Cancel the common factor of $x^{4}$ and $x^{3}$ .

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Step 1.1.1

Factor $x^{3}$ out of $a x^{4}$ .

$lim_{x \to 8} \frac{x^{3} (a x)}{d x^{3}} + \frac{b x^{2}}{e x^{2}} + \frac{c}{f x} + \frac{1}{g}$

Step 1.1.2

Cancel the common factors.

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Step 1.1.2.1

Factor $x^{3}$ out of $d x^{3}$ .

$lim_{x \to 8} \frac{x^{3} (a x)}{x^{3} d} + \frac{b x^{2}}{e x^{2}} + \frac{c}{f x} + \frac{1}{g}$

Step 1.1.2.2

Cancel the common factor.

$lim_{x \to 8} \frac{x^{3} (a x)}{x^{3} d} + \frac{b x^{2}}{e x^{2}} + \frac{c}{f x} + \frac{1}{g}$

Step 1.1.2.3

Rewrite the expression.

$lim_{x \to 8} \frac{a x}{d} + \frac{b x^{2}}{e x^{2}} + \frac{c}{f x} + \frac{1}{g}$

Step 1.2

Cancel the common factor of $x^{2}$ .

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Step 1.2.1

Cancel the common factor.

$lim_{x \to 8} \frac{a x}{d} + \frac{b x^{2}}{e x^{2}} + \frac{c}{f x} + \frac{1}{g}$

Step 1.2.2

Rewrite the expression.

$lim_{x \to 8} \frac{a x}{d} + \frac{b}{e} + \frac{c}{f x} + \frac{1}{g}$

Step 2

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $8$ .

$lim_{x \to 8} \frac{a x}{d} + lim_{x \to 8} \frac{b}{e} + lim_{x \to 8} \frac{c}{f x} + lim_{x \to 8} \frac{1}{g}$

Step 3

Move the term $\frac{a}{d}$ outside of the limit because it is constant with respect to $x$ .

$\frac{a}{d} lim_{x \to 8} x + lim_{x \to 8} \frac{b}{e} + lim_{x \to 8} \frac{c}{f x} + lim_{x \to 8} \frac{1}{g}$

Step 4

Evaluate the limit of $\frac{b}{e}$ which is constant as $x$ approaches $8$ .

$\frac{a}{d} lim_{x \to 8} x + \frac{b}{e} + lim_{x \to 8} \frac{c}{f x} + lim_{x \to 8} \frac{1}{g}$

Step 5

Move the term $\frac{c}{f}$ outside of the limit because it is constant with respect to $x$ .

$\frac{a}{d} lim_{x \to 8} x + \frac{b}{e} + \frac{c}{f} lim_{x \to 8} \frac{1}{x} + lim_{x \to 8} \frac{1}{g}$

Step 6

Split the limit using the Limits Quotient Rule on the limit as $x$ approaches $8$ .

$\frac{a}{d} lim_{x \to 8} x + \frac{b}{e} + \frac{c}{f} \cdot \frac{lim_{x \to 8} 1}{lim_{x \to 8} x} + lim_{x \to 8} \frac{1}{g}$

Step 7

Evaluate the limit of $1$ which is constant as $x$ approaches $8$ .

$\frac{a}{d} lim_{x \to 8} x + \frac{b}{e} + \frac{c}{f} \cdot \frac{1}{lim_{x \to 8} x} + lim_{x \to 8} \frac{1}{g}$

Step 8

Evaluate the limit of $\frac{1}{g}$ which is constant as $x$ approaches $8$ .

$\frac{a}{d} lim_{x \to 8} x + \frac{b}{e} + \frac{c}{f} \cdot \frac{1}{lim_{x \to 8} x} + \frac{1}{g}$

Step 9

Evaluate the limits by plugging in $8$ for all occurrences of $x$ .

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Step 9.1

Evaluate the limit of $x$ by plugging in $8$ for $x$ .

$\frac{a}{d} \cdot 8 + \frac{b}{e} + \frac{c}{f} \cdot \frac{1}{lim_{x \to 8} x} + \frac{1}{g}$

Step 9.2

Evaluate the limit of $x$ by plugging in $8$ for $x$ .

$\frac{a}{d} \cdot 8 + \frac{b}{e} + \frac{c}{f} \cdot \frac{1}{8} + \frac{1}{g}$

Step 10

Simplify each term.

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Step 10.1

Combine $\frac{a}{d}$ and $8$ .

$\frac{a \cdot 8}{d} + \frac{b}{e} + \frac{c}{f} \cdot \frac{1}{8} + \frac{1}{g}$

Step 10.2

Move $8$ to the left of $a$ .

$\frac{8 \cdot a}{d} + \frac{b}{e} + \frac{c}{f} \cdot \frac{1}{8} + \frac{1}{g}$

Step 10.3

Multiply $\frac{c}{f}$ by $\frac{1}{8}$ .

$\frac{8 a}{d} + \frac{b}{e} + \frac{c}{f \cdot 8} + \frac{1}{g}$

Step 10.4

Move $8$ to the left of $f$ .

$\frac{8 a}{d} + \frac{b}{e} + \frac{c}{8 f} + \frac{1}{g}$