0
You do not need the quadratic formula, since this can easily be factored in to linear factors.
x2 + x - 20 = (x - 4)(x + 5), thus, x = 4 or 5.
But, using the quadratic formula:
(-b +- sqrt(b2 - 4ac))/2a = (-1 +- sqrt(1 + 80))/2
(-1 + 9)/2 = 4
(-1 - 9)/2 = -5
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