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29-12-2016
Mathematics

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How to factor 9x^2-25

How to factor 9x225 class=

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29-12-2016

9x^2 - 25 = (3x-5)(3x+5)

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29-12-2016

Since the 9 and 25 are both perfect squares and it is a difference (subtraction), you have a difference of perfect squares. This always factors to the form
(a+b)(a-b).
(3x-5)(3x+5) is the answer

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