3 log(x^2-4x-5)=3 log(2x^2+x-1) adalah...

³log(x²-4x-5)=³log (2x²+x-1)

x²-4x-5=2x²+x-1
0=2x²-x²+4x+x-1+5
0=x²+5x+4
0=(x+1)(x+4)

*x+1=0
x=-1

*x+4=0
x=-4

hp={x=-1 atau x=-4}