Question

How do you simplify `(20x^6 - 13x^5) - (-7x^6 + 7x^5 - 20x^3 - 4x^2)`?

Answer 1

`=20x^6-13x^5+7x^6-7x^5+20x^3+4x^2` ( the `-` changes the signs of the numbers in the parenthesis )

`=27x^6-20x^5+20x^3+4x^2`

`=(x²)*(27x^4-20x^3+20x+4)` ( if you want to factor it )