SOLUTION: three less than a positive number times seven more than the number is 144.

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Question 855408:

three less than a positive number times seven more than the number is 144.
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
(X-3)*(X+7)=144
X^2-3X+7X-21=144
X^2+4X-21-144=0
X^2+4X-165=0
(X+15)(X-11)=0
X-11=0
X=11 ANS.
PROOF:
(11-3)(11+7)=144
8*18=144
144=144