I'm back
Alright, the answer should be -126 and 124. I am able to get 124 but not -126. Here is what I'm doing:
$\displaystyle (3-(x+1)^{2/3})/2 = -11$
$\displaystyle 3-(x+1)^{2/3} = -22$
$\displaystyle -(x+1)^2/3 = -25$
$\displaystyle (x+1)^{2/3} = 25$
$\displaystyle x+1 = 125$
$\displaystyle x = 124$
I'm only getting one answer. Where is the -126 coming from?