Evaluate
\left(y-4z+1\right)^{2}
Expand
y^{2}-8yz+2y+16z^{2}-8z+1
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y^{2}-8yz+2y+16z^{2}-8z+1
Square 1+y-4z.
y^{2}-8yz+2y+16z^{2}-8z+1
Square 1+y-4z.
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