Find the sum of the following polynomials :

$3 x^{2} + 5 x - x^{7}; - 3 x^{2} + 5 x + 8$

- x^{7} + 10 x + 8

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- x^{3} + 10 x + 8

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10 x + 8

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- x^{2} + 10 x + 8

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Solution

The correct option is A $- x^{7} + 10 x + 8$
$(3 x^{2} + 5 x - x^{7}) + (- 3 x^{2} + 5 x + 8)$

$= (- x^{7}) + 3 x^{2} - 3 x^{2} + 5 x + 5 x + 8$

$= - x^{7} + 10 x + 8$

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