\(27+y^3=\left(3+y\right)\left(9-3y+y^2\right)\\ 64-32y+4y^2=4\left(16-8y+y^2\right)=4\left(4-y\right)^2\)
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\(27+y^3=\left(3+y\right)\left(9-3y+y^2\right)\\ 64-32y+4y^2=4\left(16-8y+y^2\right)=4\left(4-y\right)^2\)