(x - 7)(x - 1) or (x + 7)(x + 1) depending on sign of 8x so zero is +/- 7 and +/- 1
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I'll show work. X2-8x-4=0. X2-8x=4. X-8x=2. -7x=2. X=-(2/7).
x2 + 8x - 2 = 0 => x2 + 8x = 2 => x2 + 8x + 16 = 2 + 16 = 18 => (x + 4)2 = 18 => x + 4 = +or- sqrt(18) = +or- 3*sqrt(2) so x = -4 +or- 3*sqrt(2)
x2 + 8x + 12 = (x + 6) (x + 2)
X2 - 8X + 15 = (X - 3)(X - 5)
x2+8x+12 = 0 When factorized: (x+6)(x+2) = 0 Therefore: x = -6 or x = -2