Solve for C
C=4\left(4-x\right)^{2}
Solve for x (complex solution)
x=\frac{\sqrt{C}}{2}+4
x=-\frac{\sqrt{C}}{2}+4
Solve for x
x=\frac{\sqrt{C}}{2}+4
x=-\frac{\sqrt{C}}{2}+4\text{, }C\geq 0
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C=64-32x+4x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(8-2x\right)^{2}.
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