2√(4y+5)=5√(y+4)
2/5 = √ {(y+4)/(4y+5)}
(2/5)^2 = [ √(y+4)/(4y+5) ]^2 square root on both the sides
4/25 = (y+4)/(4y+5) now cross multiply
4 (4y+5) = 25 (y+4) open the brackets
16y+20 = 25y+100 take the y's on 1 side
16y-25y = 100-20
-9y = 80
y = -80/ 9 Answer..............................hope it helps :)