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This type of statement is called a difference of squares. If you see an equation in the form:

a2 - b2


then it is also equal to:


(a + b)(a - b)


In this case 9x2, and 25 are both perfect squares. 9x2 is equal to (3x)2 and 25 is equal to 52, so the that statement can be factored out as:


(3x - 5)(3x + 5)

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Q: How do you factor 9x squared minus 25?
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