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How to solve and perform the indicated operation

How to solve and perform the indicated operation-example-1

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Multiply h(x) by 2 to get 4x^3-8. Then multiply g(x) by 2 to get 4x. Now add the results together to get 4x^3-8+4x or, in descending order, 4x^3 + 4x - 8
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