Solve for C
C=7+7x-10x^{2}
Solve for x (complex solution)
x=\frac{\sqrt{329-40C}+7}{20}
x=\frac{-\sqrt{329-40C}+7}{20}
Solve for x
x=\frac{\sqrt{329-40C}+7}{20}
x=\frac{-\sqrt{329-40C}+7}{20}\text{, }C\leq \frac{329}{40}
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C=8x-10x^{2}-\left(x-7\right)
Use the distributive property to multiply 2x by 4-5x.
C=8x-10x^{2}-x+7
To find the opposite of x-7, find the opposite of each term.
C=7x-10x^{2}+7
Combine 8x and -x to get 7x.
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