Question 162540
(X+1)(2X+1)=45
2X^2+3X+1=45
2X^2+3X+1-45=0
2X^2+3X-44=0
(2X+11)(X-4)=0
X-4=0
X=4 
(4+1)=5 FOR A
(2*4+1)=9 FOR B
PROOF:
5*9=45