Question

|(x+1)³-(x-2)³|=9
Pleeeaseee

Answer 1

l(x+1)³-(x-2)³l=9
lx³+3x²+3x²-1³-x³-3x²+3x²-1³l=9
l6x²-2l=9
          -9≤6x²-2≤9  l + 2
          -11≤6x²≤11 l :6
           $\frac{-11}{6}$ ≤6≤$\frac{+11}{6}$
x∈$[ \sqrt{ \frac{-11}{6} } , \sqrt \frac{11}{6} ]$

Intr-un fel e bn.. intr-alt fel.. sper sa fie bine..