If you mean x² + 9x +8 = 0
you use the quadratic equation.
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x2 - 9x + 8 = (x-1)(x-8)
x2-9x+8=0 has two solutions:x = 8x = 1
x2 - 9x = -8 ∴ x2 - 9x + 8 = 0 ∴ (x - 1)(x - 8) = 0 You can then solve it as well: ∴ x ∈ {1, 8}
i thinking this answer should be -20
(x + 8)(x + 1)