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Anonymous
x 2 - 5x - 36 = 0; factor.
(x-9)(x+4) = 0; set each factor = 0.
x - 9 = 0 and x + 4 = 0
So, x = 9 and x = -4.
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(5x - 2y)(5x + 2y)
3x2 - 5x2 = -2x2
-x2+2x
(x - 1)(5x + 7)
It is: 5(x^2 -16)