log2(x+1)^2+log4(x+1)=5
log2(x+1)^2+(lg(x+1))/(lg4)=5
log2(x+1)^2+(lg(x+1))/(2lg2)=5
2log2(x+1)+(log2(x+1))/2=5
4log2(x+1)+log2(x+1)=10
5log2(x+1)=10
log2(x+1)=2
2^2=x+1
x=3