SOLUTION: A number is 90 less than its square. Find all such numbers.

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Question 526989: A number is 90 less than its square. Find all such numbers.
Answer by Alan3354(69443) About Me  (Show Source):
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A number is 90 less than its square. Find all such numbers.
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x = x^2 - 90
x^2 - x - 90 = 0
(x-10)*(x+9) = 0
x = -9, 10