emilybb195 emilybb195 17-02-2017 Mathematics contestada Please help !! Simplify the following expressionx^4+3x^3-2x^3-5x^2-x+x^2+x+1+7x^4A. 8x^4+x^3-4x^2+0xB. 8x^4+x^3-4x^2+1C. 8x^4+5x^3+4x^2+0x+1D. 8x^4+5x^3+4x^2+1