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4. (15 p) Determine the roots of the simultaneous nonlinear equations y = -x2 + x +0.75) Use a graphical approach to obtain your initial guesses. Determine refined estimates with solver tool from Excel or a software package of your choice. v+= ) (15) Salbefolie ftini D11Tdcitie 4. (15 p) Determine the roots of the simultaneous nonlinear equations y = -x2 + x +0.75) Use a graphical approach to obtain your initial guesses. Determine refined estimates with solver tool from Excel or a software package of your choice. v+= ) (15) Salbefolie ftini D11Tdcitie