Question 100671
SQRT(2Y+7)+4=Y
SQRT(2Y+7)=Y-4 NOW SQUARE BOTH SIDES OF THE EQUATION.
2Y+7=Y^2-8Y+16
Y^2-8Y-2Y+16-7
Y^2-10Y+9=0
(Y-9)(Y-1)=0
Y-9=0
Y=9 ANSWER.
Y-1=0
Y=1 ANSWER.
PROOF
SQRT(2*9+7)+4=9
SQRT(18=7)=9-4
SQRT25=5
5=5