SOLUTION: Find the number which,when added to its square,makes 90?

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Question 810695: Find the number which,when added to its square,makes 90?
Answer by fcabanski(1391) About Me  (Show Source):
You can put this solution on YOUR website!
x+%2B+x%5E2+=+90


x%5E2+%2B+x+-90+=+0


(x+10)(x-9) = 0


x = -10 or 9