Solve for n
n=256-r^{2}
Solve for r
r=\sqrt{256-n}
r=-\sqrt{256-n}\text{, }n\leq 256
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r^{2}+n-256=0
Calculate 16 to the power of 2 and get 256.
n-256=-r^{2}
Subtract r^{2} from both sides. Anything subtracted from zero gives its negation.
n=-r^{2}+256
Add 256 to both sides.
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