# Precalculus Examples

,

Consider the difference quotient formula. Use this formula to solve for the slope of the secant line .

Evaluate the function at .

Replace the variable with in the expression.

Simplify the result.

Remove parentheses.

The final answer is .

Find the components of the definition.

Plug in the components.

Simplify the numerator.

Multiply by to get .

Subtract from to get .

Add and to get .

Reduce the expression by cancelling the common factors.

Cancel the common factor.

Divide by to get .