It's a square factor.
25x2-36.
5x*5x 6*6
Answer: (5x-6)(5x+6)
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(x + 6)(x - 6)
1296. The square ROOT of 36 is 6. Different matters.
6 squared (62) is 36.
36
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.