$$(4y+8x)(8x+2y)$$
$8\left(2x+y\right)\left(4x+y\right)$
$$32yx+8y^{2}+64x^{2}+16xy$$
$$48yx+8y^{2}+64x^{2}$$
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$64x^{2}+48xy+8y^{2}$