Answer:
2x^5-10x^4-8x^3
Explanation:
2x^3 ( x^2 - 5x-4)
Distribute
2x^3 * x^2 - 2x^3 -5x -2x^3 *4
2 x^(3+2) - 10 x^(3+1) - 8x^3
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