Solve for x_21
x_{21}=\frac{y-x^{2}}{4}
Solve for x (complex solution)
x=-\sqrt{y-4x_{21}}
x=\sqrt{y-4x_{21}}
Solve for x
x=\sqrt{y-4x_{21}}
x=-\sqrt{y-4x_{21}}\text{, }y\geq 4x_{21}
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4x_{21}=y-x^{2}
Swap sides so that all variable terms are on the left hand side.
\frac{4x_{21}}{4}=\frac{y-x^{2}}{4}
Divide both sides by 4.
x_{21}=\frac{y-x^{2}}{4}
Dividing by 4 undoes the multiplication by 4.
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