SOLUTION: factor polynomial completely 18rs^2-2r

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Question 519113: factor polynomial completely 18rs^2-2r
Answer by mamiya(56) About Me  (Show Source):
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18rs^2-2r = 2*9rs^2 -2r
= 2r( 9s^2 -1)
=2r (3s-1)(3s+1) since (a-b)(a+b)= a^2 - b^2
so the answer is: 2r(3s-1)(3s+1)