# Precalculus Examples

Cancel the common factor.

Divide by .

To find the holes in the graph, look at the denominator factors that were cancelled.

Set equal to .

Add to both sides of the equation.

Substitute for in and simplify.

Substitute for to find the coordinate of the hole.

Simplify.

Multiply by .

Add and .

The holes in the graph are the points where any of the cancelled factors are equal to .