Try another version of this question Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Add the 2 polynomials:
`(5x^4+9x^3+8x) + (-7x^4-6x^3+9)`
Be sure your variables match those in the question `-2x^4+3x^3+8x+9`