Question 121277
(X/(X+7))^2=(4X)/(X+7)-4
X^2/(X^2+14X+49)=4X/(X+7)-4
X^2/(X^2+14X+49)=(4X-4(X+7))/(X+7)
X^2/(X^2+14X+49)=(4X-4X-28)/(X+7)
X^2/(X^2+14X+49)=-28/(X+7) NOW CROSS MULTIPLY
X^2(X+7)=-28(X^2+14X+49)
X^2(X+7)=-28(X+7)(X+7) DIVIDE BOTH SIDES BY (X+7)
X^2=-28X-196
X^2+28X+196=0
(X+14)^2=0
X+14=0
X=-14 ANSWER.
PROOF
[-14/(-14+7)]^2=4*-14/(-14+7)-4
(-14/-7)^2=-56/-7-4
2^2=8-4
4=4