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y=-\frac{7}{640}\left(160-80\right)^{2}+70
Fraction \frac{7}{-640} can be rewritten as -\frac{7}{640} by extracting the negative sign.
y=-\frac{7}{640}\times 80^{2}+70
Subtract 80 from 160 to get 80.
y=-\frac{7}{640}\times 6400+70
Calculate 80 to the power of 2 and get 6400.
y=-70+70
Multiply -\frac{7}{640} and 6400 to get -70.
y=0
Add -70 and 70 to get 0.
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