7. Find all relative extrema and where they occur of the function f(x) =3x In NIX8. Find all relative extrema and Where they occur of the function f(x) = 2x?" . 9. Find all relative extrema and where they occur of the function f(x) = x3 + 72c2 15x 10. Find all relative extrema and where they occur of the function _f'(x) = 8x(4"")