X2 - 8X + 15 = (X - 3)(X - 5)
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x + 3
what is -12X squared +28X - 15? i figured it out myself. its (-6X + 5)(2X - 3).
It is impossible but if it were x squared plus 2x minus 15 the equation would be (x+5) (x-3) with x being equal to either -5 or 3. If the original problem was x squared minus 2x minus 15 the equation would be (x-5)(x+3) and x would be equal to either 5 or -3
x2 + 2x - 15 = 0(x + 5) (x - 3) = 0x = -5x = +3