# Precalculus Examples

,

Roots (also called zeros) are the points where the graph intercepts with the x-axis .

at the roots

The root at was found by solving for when and ( because the root is the x-intercept).

The factor is

The root at was found by solving for when and ( because the root is the x-intercept).

The factor is

Combine all the factors into a single equation.

Expand using the FOIL Method.

Apply the distributive property.

Apply the distributive property.

Apply the distributive property.

Simplify and combine like terms.

Simplify each term.

Multiply by .

Move to the left of .

Multiply by .

Add and .

Add and .