Solve for y
y=-5\left(x+9\right)^{2}
Solve for x (complex solution)
x=-\frac{i\sqrt{5y}}{5}-9
x=\frac{i\sqrt{5y}}{5}-9
Solve for x
x=-\frac{\sqrt{-5y}}{5}-9
x=\frac{\sqrt{-5y}}{5}-9\text{, }y\leq 0
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y=-5\left(x^{2}+18x+81\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+9\right)^{2}.
y=-5x^{2}-90x-405
Use the distributive property to multiply -5 by x^{2}+18x+81.
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