Question

${x}^{2} - {2x}^{2} - 9 + {5x}^{3} + 2x + 9$
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Answer 1

Step-by-step explanation:

${x}^{2} - {2x}^{2} - 9 + {5x}^{3} + 2x + 9 \\ - {x}^{2} - 9 + 9 + 5 {x}^{3} + 2 x \\ - {x}^{2} + 5 {x}^{3} + 2x$