Answer
$16y^2-8y+1+8yz-2z+z^2$
Work Step by Step
Use the formula $(a+b)^2=a^2+2ab+b^2$ and treat $4y-1$ as a single term, we have:
$[(4y-1)+z]^2=(4y-1)^2+2(4y-1)z+z^2=16y^2-8y+1+8yz-2z+z^2$
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