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3x⁷ + 7x⁴ + 2x + 7

Explanation:
Before we begin, remember the following:
(-ve)*(-ve) = +ve
(-ve)*(+ve) = -ve
(+ve)*(-ve) = -ve
(+ve)*(+ve) = +ve

No, for the given, we have:
(3x⁷ + 8x⁴ +7) - (x⁴ - 2x)

First, we will remove the brackets based on the rules above. This will give us:
3x⁷ + 8x⁴ +7 - x⁴ + 2x

Now, we will add the like terms as follows:
3x⁷ + (8-1) x⁴ + 2x + 7

This will give us the final expression:
3x⁷ + 7x⁴ + 2x + 7

Hope this helps :)

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