Could someone me answer this? solve -2log8(x + 1) = -8. so much!

Step one, divide both sides by -2
log8(x+1)=4

if the base is 10, and the 8 is together with (x+1): (cannot tell from the way it is written)
8(x+1)=10^4=10000
x+1=1250
x=1249

if the 8 is a base, 
8^4=(x+1)
x+1=4096
x=4095

Do you need with the x value for the minimum? its always between the two intercepts for a parabola