Solve for y
y=x^{2}-4x+16
Solve for x (complex solution)
x=\sqrt{y-12}+2
x=-\sqrt{y-12}+2
Solve for x
x=\sqrt{y-12}+2
x=-\sqrt{y-12}+2\text{, }y\geq 12
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y=16+x^{2}-4x
Add 13 and 3 to get 16.
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