SOLUTION: need help on factoring if you can be of assistance anyone... i need to factor completely 7x2 – 28y2 and also 3x2 + 23x – 36 thank you Paul

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Question 142826: need help on factoring if you can be of assistance anyone... i need to factor completely

7x2 – 28y2 and also 3x2 + 23x – 36
thank you
Paul
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
common factors first __ 7(x^2-4y^2) __ then difference of squares __ 7(x+2y)(x-2y)

factors of -36 that "combine" with factors of 3 to give 23 __ (3x-4)(x+9)