# Factoring trinomials where a = 1

Factor each polynomial completely. Then check your answer.

## Perfect Square Trinomial

It is a special polynomial consisting of three terms. Two of the terms in a perfect trinomial are perfect squares.

## What constant term should be added to the given expression below to create a perfect square trinomial?

x^{2 } + 10x +______

How can you identify if the expression is a perfect square trinomial?