SOLUTION: Solve by using the quadratic formula. x^2 + x - 20 = 0 Thanks!

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Question 46887: Solve by using the quadratic formula.
x^2 + x - 20 = 0
Thanks!
Answer by fractalier(2101) About Me  (Show Source):
You can put this solution on YOUR website!
Okay from
x^2 + x - 20 = 0
we get
x = (-1 ± sqrt(1 - (-80))) / 2
x = (-1 ± sqrt(81)) / 2
x = (-1 ± 9) / 2
x = -5 or 4