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Solve for y
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Solve for x (complex solution)
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y=4\left(x^{2}-2x+1\right)-4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-1\right)^{2}.
y=4x^{2}-8x+4-4
Use the distributive property to multiply 4 by x^{2}-2x+1.
y=4x^{2}-8x
Subtract 4 from 4 to get 0.