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Please multiply and simplify the answer

I am having trouble with

(3x+7)(4x^2+2x+8)

multiply 3x by each of the terms in the second bracket + 7 times each of the terms in the second bracket

= 12x^3 + 6x^2 + 24x + 28x^2 + 14x + 56
= 12x^3 + 34x^2 + 38x + 56

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