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x^{2}+2x+1+y=\frac{1}{4}
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
2x+1+y=\frac{1}{4}-x^{2}
Subtract x^{2} from both sides.
1+y=\frac{1}{4}-x^{2}-2x
Subtract 2x from both sides.
y=\frac{1}{4}-x^{2}-2x-1
Subtract 1 from both sides.
y=-\frac{3}{4}-x^{2}-2x
Subtract 1 from \frac{1}{4} to get -\frac{3}{4}.