9(2x - 1)(2x + 1)
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(4x - 3)(2x + 3)
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.
4x2 - 9 = (2x + 3)(2x - 3)
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It is: 100x^2 -9 = (10x-3)(10x+3) when factored