Question

R^3 + r^2 = r^2 - 64

Answer 1

We have the following equation

`r^3+r^2=r^2-64`

and we want to find r.

We can note that the term r squared is in both sides, then we can cancel r^2 out and get

`r^3=64`

By applying cubic root in both sides, we have

`r=\sqrt[3]{64}`

then, the answer is

`r=4`