Question

1.(2x+3x3−5x3+2x4+5x−1)+(8x3−x4+5x2−9x3)=

Answer 1

$(2x+3x^3-5x^3+2x^4+5x-1)+(8x^3-x^4+5x^2-9x^3)= \\ 2x+3x^3-5x^3+2x^4+5x-1+8x^3-x^4+5x^2-9x^3= \\ (2x^4-x^4)+(3x^3-5x^3+8x^3-9x^3)+(5x^2)+(2x+5x)+(-1)= \\ -3x^4-3x^3+5x^2+7x-1 \\ Saludos$