(2y + 1)3 = -125
(2y + 1)3 = (-5)3
=> 2y + 1 = -5
=> 2y = -6
=> y = (-6) : 2
=> y = -3
\(\left(2y+1\right)^3=-125\)
\(\left(2y+1\right)^3=\left(-5\right)^3\)
\(\Rightarrow2y+1=-5\)
\(\Rightarrow2y=-5-1\)
\(\Rightarrow2y=-6\)
\(\Rightarrow y=-3\)
(2y + 1)3 = -125
(2y + 1)3 = (-5)3
2y + 1 = -5
2y = -5 - 1
2y = -6
y = -6 : 2
y = -3