SOLUTION: when a positive number is added to its square, the sum is 240. find the number.

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Question 376737: when a positive number is added to its square, the sum is 240. find the number.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E2+%2B+x=+240
x%5E2+%2B+x+-+240=0,
(x-15)(x+16) = 0, hence x =15.