Solve for y
y=\left(1-x_{2}\right)^{2}
1-x_{2}\geq 0
Solve for x_2 (complex solution)
x_{2}=-\sqrt{y}+1
Solve for y (complex solution)
y=\left(1-x_{2}\right)^{2}
x_{2}=1\text{ or }arg(1-x_{2})<\pi
Solve for x_2
x_{2}=-\sqrt{y}+1
y\geq 0
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\sqrt{y}+x_{2}-x_{2}=1-x_{2}
Subtract x_{2} from both sides of the equation.
\sqrt{y}=1-x_{2}
Subtracting x_{2} from itself leaves 0.
y=\left(1-x_{2}\right)^{2}
Square both sides of the equation.
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