Solve for k
k=\left(9-w\right)^{2}
Solve for w
w=\sqrt{k}+9
w=-\sqrt{k}+9\text{, }k\geq 0
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k=81-18w+w^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(9-w\right)^{2}.
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