15x2 + 2x - 56
= 15x2 + 30x - 28x - 56
= 15x(x + 2) - 28(x + 2)
= (15x - 28)(x + 2)
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x2 + 8x + 15 = (x + 3) (x + 5).
x2+xx = 15 Which is the same as: x2+x2 =15 2x2 = 15 x2 = 7.5 x = the square root of 7.5
3x4 plus 5x3 plus x2 - 5 divided by x 2 =[(3x4) + (5x3) + (x2 - 5)]/x2 =(12 + 15 + x2 -5)/x2 =(27 - 5 + x2)/x2 =(22 + x2)/x2
x2 + 2x - 15 = (x - 3)(x + 5)
x2 + 2x - 15 = (x + 5)(x - 3)