How to get answer by Mimiwhatsup:
[tex]\left(-4x^4+5x^3-x^2+1\right)+\left(2x^4-7x^3+6x^2+2x\right)\\\mathrm{Remove\:parentheses}:\quad \left(a\right)=a\\=-4x^4+5x^3-x^2+1+2x^4-7x^3+6x^2+2x\\\mathrm{Group\:like\:terms}\\=-4x^4+2x^4+5x^3-7x^3-x^2+6x^2+2x+1\\\mathrm{Add\:similar\:elements:}\:-x^2+6x^2=5x^2\\=-4x^4+2x^4+5x^3-7x^3+5x^2+2x+1\\\mathrm{Add\:similar\:elements:}\:5x^3-7x^3=-2x^3\\=-4x^4+2x^4-2x^3+5x^2+2x+1\\\mathrm{Add\:similar\:elements:}\:-4x^4+2x^4=-2x^4\\Answer: -2x^4-2x^3+5x^2+2x+1[/tex]
