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Factor the following expression: x^2-9

Monday, July 19th, 2010

Solution:

First recognize that this is in the form of (x2-a2), which can always be factored as (x+a)(x-a). If you multiply these two terms, you get x2-ax+ax-a2, which is equal to x2-a2.

So in this case, we can see that a=3,

so  x2-9

=  x2-32

= (x+3)(x-3)

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Posted in 9th Grade, Algebra Homework, Homework Answers, Math Answers.

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