# Precalculus Examples

,

Since the roots of an equation are the points where the solution is , set each root as a factor of the equation that equals .

Expand using the FOIL Method.

Apply the distributive property.

Apply the distributive property.

Apply the distributive property.

Simplify terms.

Combine the opposite terms in .

Reorder the factors in the terms and .

Subtract from .

Add and .

Simplify each term.

Multiply by .

Multiply by .