Answer:
64x^3+88x^2+80x+56
Explanation:
(8x+8)(8x^2+3x+7)
64x^3+24x^2+56x+64x^2+24x+56
64x^3+24x^2+64x^2+56x+24x+56
8x^3 + 24x^2 + 56x + 64x^2 +24x +56
8x^3 + 88x^2 + 80x +56
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