Solve this algebra 2 problem please?

Question

The polynomial function f is defined by f(x)=-4x^4-9x^3+2x^2+7x-2 Use the ALEKS graphing calculator to find all the points (x,f(x))where there is a local minimum. Round to the nearest hundredth. If there is more than one point, enter them using the "and" button.

Answer 1

My graphing calculator (not an ALEKS) provded:

 

relative maxima at (-1.68, 2.7) and (0.51, 0.63)

relative minimum at (-0.51, -4,13)