SOLUTION: a certain number is subtracted from 18 and from 13. The product of the two numbers obtained is 66 . find the first number.

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Question 1005479: a certain number is subtracted from 18 and from 13. The product of the two numbers obtained is 66 . find the first number.

Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call the number x. Then we have
(18 - x)(13 - x) = 66
234 - 31x + x^2 = 66
or
x^2 - 31x + 168 = 0
(x - 24)(x - 7) = 0
x = 24 or x = 7
Two solutions.