Respuesta :
The first thing you need to do is distribute the 7x^2 to the values inside the parenthesis.
7x^2(x^3-6x)+2x^5
7x^5-42x^3+2x^5 combine like terms
9x^5-42^3
7x^2(x^3-6x)+2x^5
7x^5-42x^3+2x^5 combine like terms
9x^5-42^3