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i dont understand how i should go about solving b

so i got 2.5 as the positive solution

u should get 7.5 and -0.5 are u sure u did it right?

guess not

\[t=\frac{-16 \pm \sqrt{16^2-4(-16)(64)}}{2(-16)}\]

re check ur calculations

ive got -224

yeah u got it right