Solve for y
y=-x\left(x-6\right)
Solve for x (complex solution)
x=-\sqrt{9-y}+3
x=\sqrt{9-y}+3
Solve for x
x=-\sqrt{9-y}+3
x=\sqrt{9-y}+3\text{, }y\leq 9
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y=9-\left(x^{2}-6x+9\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-3\right)^{2}.
y=9-x^{2}+6x-9
To find the opposite of x^{2}-6x+9, find the opposite of each term.
y=-x^{2}+6x
Subtract 9 from 9 to get 0.
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