Answer:
5x^4 - 6x^3 - 11x^2 + 14x
Explanation:
(5x^4 - 3x^3 + 6x) - (3x^3 + 11x^2 - 8x)
= 5x^4 - 3x^3 + 6x - 3x^3 + 11x^2 - 8x
= 5x^4 - 3x^3 - 3x^3 - 11x^2 + 6x + 8x
= 5x^4 - 6x^3 -11x2 + 14x
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