If that's -8x, the answer is (x - 4)(x - 4) or (x - 4)2
If that's +8x, the answer is (x + 4)(x + 4) or (x + 4)2
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x2-8x+15 = (x-3)(x-5)
No because the discriminant is less than zero.
If that's + 8x - 48, the answer is (x + 12)(x - 4) If that's - 8x - 48, the answer is (x - 12)(x + 4)
If that's + 8x, the answer is 4(x2 + 2x - 6) If that's - 8x, the answer is 4(x2 - 2x - 6)
x2 - 5x + 6 = (x - 2)(x - 3)