Question 132987
Based on your recent note, the problem is asking for the inverse function of
{{{f(x) = (x + 48.2)^3}}}

First, replace {{{f(x)}}} with y.

{{{y = (x + 48.2)^3}}}

Now, solve for x.
{{{cuberoot(y) -48.2 = x}}}

Reorder as
{{{x = cuberoot(y) -48.2}}}

Finally, replace every x with y and every y with x as follows:

{{{y = cuberoot(x)-48.2}}}

That is the inverse function


Now solve when x = (-8)
{{{y = cuberoot(x) -48.2}}}
{{{y = cuberoot(-8) - 48.2}}}
{{{y = -2 - 48.2}}}
y = -50.2