SOLUTION: if a number is subtracted from its square the result is 72. find the number

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Question 604352: if a number is subtracted from its square the result is 72. find the number
Answer by flame8855(424) About Me  (Show Source):
You can put this solution on YOUR website!
x^2-x = 72
x^2-x-72 = 0
(x-9)(x+8)=0
x = 9
x = -8
so x = 9 is the number