Question

solve for y in
y+3 = sqrt(3y+7)

Answer 1

square both sides

Answer 2

but what do u do when you get the y^2+9 = 3y +7

Answer 3

that's not what you get when you square (y+3).
(y+3)^2 = (y+3)(y+3) = y^2 + 6y + 9.
now equate this with the right side of 3y + 7 and solve.
Remember to check your solution(s)...

Answer 4

the answer would be y=-2, and y=-1