Question 855408
(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