Calculus Examples

$lim_{x \to 4} x^{2} - 4 x + 3$

Step 1

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

$lim_{x \to 4} x^{2} - lim_{x \to 4} 4 x + lim_{x \to 4} 3$

Step 2

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

${(lim_{x \to 4} x)}^{2} - lim_{x \to 4} 4 x + lim_{x \to 4} 3$

Step 3

Move the term $4$ outside of the limit because it is constant with respect to $x$ .

${(lim_{x \to 4} x)}^{2} - 4 lim_{x \to 4} x + lim_{x \to 4} 3$

Step 4

Evaluate the limit of $3$ which is constant as $x$ approaches $4$ .

${(lim_{x \to 4} x)}^{2} - 4 lim_{x \to 4} x + 3$

Step 5

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

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Step 5.1

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

$4^{2} - 4 lim_{x \to 4} x + 3$

Step 5.2

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

$4^{2} - 4 \cdot 4 + 3$

Step 6

Simplify the answer.

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Step 6.1

Simplify each term.

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Step 6.1.1

Raise $4$ to the power of $2$ .

$16 - 4 \cdot 4 + 3$

Step 6.1.2

Multiply $- 4$ by $4$ .

$16 - 16 + 3$

Step 6.2

Subtract $16$ from $16$ .

$0 + 3$

Step 6.3

Add $0$ and $3$ .

$3$