log4[(x+1)^2]=log2[(x+1)^2]/log2(4)=log2[(x+1)^2]/2
原方程化为：log2(x+1)^2+1/2log2(x+1)^2=5
3/2log2(x+1)^2=5
log2(x+1)^2=10/3
(x+1)^2=2^(10/3)
x+1=(+/-)2^(5/3)
x1=-1+2^(5/3)
x2=-1-2^(5/3)