Add the following:
$2 x^{3} - 9 x^{2} + 8, 3 x^{2} - 6 x - 5, 7 x^{3} - 10 x + 1$ and $3 + 2 x - 5 x^{2} - 4 x^{3}$

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Solution

Add the following:
$(2 x^{3} - 9 x^{2} + 8) + (3 x^{2} - 6 x - 5) + (7 x^{3} - 10 x + 1) + (3 + 2 x - 5 x^{2} - 4 x^{3})$
= $2 x^{3} + 7 x^{3} - 4 x^{3} - 9 x^{2} - 5 x^{2} + 3 x^{2} - 6 x - 10 x + 2 x + 8 - 5 + 1 + 3$
$= 5 x^{3} - 11 x^{2} - 14 x + 7$

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