Solve for V
V=4x\left(10-x\right)^{2}
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V=x\left(400-80x+4x^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(20-2x\right)^{2}.
V=400x-80x^{2}+4x^{3}
Use the distributive property to multiply x by 400-80x+4x^{2}.
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