Select the quadratic that has roots x = 8 and x = -5.
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The quadratic equation with roots x = 8 and x = -5 can be written as:
(x - 8)(x + 5) = 0
Expanding this equation:
x^2 + 5x - 8x - 40 = 0
x^2 - 3x - 40 = 0
Therefore, the quadratic equation with roots x = 8 and x = -5 is:
x^2 - 3x - 40 = 0.