Solve for A
A=-x\left(x-40\right)
Solve for x (complex solution)
x=\sqrt{400-A}+20
x=-\sqrt{400-A}+20
Solve for x
x=\sqrt{400-A}+20
x=-\sqrt{400-A}+20\text{, }A\leq 400
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A=40x-x^{2}
Use the distributive property to multiply x by 40-x.
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