Question 115534
factor: 9x^2-25. the answer I got was(5+3x)(-5+3x)
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One of the factorable forms is "the difference of squares";
The form and factors look like this: a^2-b^2= (a-b)(a+b)
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Your Problem:
9x^2-25 can be written as:
(3x)^2 - (5^2)
The factors are (3x-5)(3x+5)
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Your answer is correct; just written backwards.
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Cheers,
Stan H.