(64a²-56ab+49b²) (8a+7b)

We know that $(a + b) (a^{2} - a b + b^{2}) = a^{3} + b^{3}$
$∴ (64 a^{2} - 56 a b + 49 b^{2}) (8 a + 7 b) = (8 a + 7 b) [(8 a)^{2} - (8 a) (7 b) + (7 b)^{2}] = (8 a)^{3} + (7 b)^{3} = 512 a^{3} + 343 b^{3}$

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(64a2-56ab+49b2) (8a+7b)

(64a²-56ab+49b²) (8a+7b)