Combine the like terms by adding the coefficients, ->5x^4 can't add anything so leave it there, ->-3x^3 can add -3x^3 which gives you -6x^3, ->We can't do anything with -11x^2 so leave it there as well, ->6x add to -(-8x) gives you 14x, You will get for your final answer is 5x^4-6x^3-11x^2+14x.
