Evaluate
-\frac{49t^{2}}{10}+\frac{147t}{10}+78
Factor
-\frac{49\left(t-\left(-\frac{\sqrt{3561}}{14}+1.5\right)\right)\left(t-\left(\frac{\sqrt{3561}}{14}+1.5\right)\right)}{10}
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78+14.7t-4.9t^{2}
Subtract 2 from 80 to get 78.
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