# Precalculus Examples

The maximum or minimum of a quadratic function occurs at . If is negative, the maximum value of the function is . If is positive, the minimum value of the function is .

occurs at

Find the value of equal to .

Substitute in the values of and .

Remove the extra parentheses from the expression .

Remove the parentheses from the numerator.

Remove the parentheses from the denominator.

Multiply by .

Reduce the expression by cancelling the common factors.

Factor out of .

Divide by .

Multiply by .

Replace the variable with in the expression.

Simplify the result.

Simplify each term.

Remove parentheses around .

Raising to any positive power yields .

Subtract from .

The final answer is .