SOLUTION: A girl's age in 12 years's time is the square of her present age. Fine her present age.

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Question 604796: A girl's age in 12 years's time is the square of her present age. Fine her present age.
Answer by alicealc(293) About Me  (Show Source):
You can put this solution on YOUR website!
girl's age in present = x
x+%2B+12+=+x%5E2
0+=+x%5E2+-+x+-+12
0 = (x - 4)*(x + 3)
x - 4 = 0 or x + 3 = 0
x = 4 or x = -3
since the age can't be a negative number, we choose x = 4

so, at the present, the girl is 4 years old