Solve for y
y=-4000\left(x-20\right)\left(x+10\right)
Solve for x (complex solution)
x=\frac{\sqrt{9000000-10y}}{200}+5
x=-\frac{\sqrt{9000000-10y}}{200}+5
Solve for x
x=\frac{\sqrt{9000000-10y}}{200}+5
x=-\frac{\sqrt{9000000-10y}}{200}+5\text{, }y\leq 900000
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y=800000+40000x-4000x^{2}
Use the distributive property to multiply 4+0.4x by 200000-10000x and combine like terms.
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