# 9.9: Factor Polynomials Using Special Products

Difficulty Level: Basic Created by: CK-12
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TermDefinition
difference of two squares The difference of two squares has the form $a^2-b^2=(a+b)(a-b)$.
Difference of Squares A difference of squares is a quadratic equation in the form $a^2-b^2$.
Perfect Square Trinomial A perfect square trinomial is a quadratic expression of the form $a^2+2ab+b^2$ (which can be rewritten as $(a+b)^2$) or $a^2-2ab+b^2$ (which can be rewritten as $(a-b)^2$).
Quadratic form A polynomial in quadratic form looks like a trinomial or binomial and can be factored like a quadratic expression.

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Difficulty Level:
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