Here, the given equation is (2x3−5x2−5x)+(5x3−x2+4x+4).(2x3−5x2−5x)+(5x3−x2+4x+4).

We have to simplify the given equation.

∴(2x3−5x2−5x)+(5x3−x2+4x+4)=2x3−5x2−5x+5x3−x2+4x+4=2x3+5x3−5x2−x2−5x+4x+4=7x3−6x2−x+4∴(2x3−5x2−5x)+(5x3−x2+4x+4)=2x3−5x2−5x+5x3−x2+4x+4=2x3+5x3−5x2−x2−5x+4x+4=7x3−6x2−x+4

Therefore, (2x3−5x2−5x)+(5x3−x2+4x+4)=7x3−6x2−x+4.