Evaluate
\left(x+y\right)^{8}+3\left(8-y\right)^{8}
Expand
x^{8}+56x^{3}y^{5}+28x^{2}y^{6}+8xy^{7}+4y^{8}-192y^{7}+5376y^{6}-86016y^{5}+860160y^{4}+56y^{3}x^{5}-5505024y^{3}+28y^{2}x^{6}+22020096y^{2}+8yx^{7}-50331648y+70\left(xy\right)^{4}+50331648
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