15x2 - 30x -720 = 15(x - 8)(x + 6).
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2(5x - 1)(3x - 2)
The GCF is 15x^2y^2
5x(6x + 7y + 8)
2x2 - 30x - 152 = 0 simplify x2 - 15x - 76 = 0 since -76 = -19 x 4 and -19 + 4 = -15, we have (x + 4)(x - 19) = 0 x + 4 = 0 or x - 19 = 0 x = -4 or x = 19
15x2 + 2x - 56 = 15x2 + 30x - 28x - 56 = 15x(x + 2) - 28(x + 2) = (15x - 28)(x + 2)