Precalculus Examples

$lim_{x \to 4} 20 x - 12$

Take the limit of each term.

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Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $4$ .

$lim_{x \to 4} 20 x - lim_{x \to 4} 12$

Move the term $20$ outside of the limit because it is constant with respect to $x$ .

$20 lim_{x \to 4} x - lim_{x \to 4} 12$

Evaluate the limits by plugging in $4$ for all occurrences of $x$ .

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Evaluate the limit of $x$ by plugging in $4$ for $x$ .

$20 \cdot 4 - lim_{x \to 4} 12$

Evaluate the limit of $12$ which is constant as $x$ approaches $4$ .

$20 \cdot 4 - 12$

Simplify the answer.

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Multiply $20$ by $4$ .

$80 - 12$

Subtract $12$ from $80$ .

$68$

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