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baseball hits the ground when \(h=0\).

ok

\[\frac{ -64\sqrt{64^{2}+16*-4} }{ 2*16 }\]
\[\frac{ -64\sqrt{64^{2}-64} }{ 32 }\]

it should be +64 outside the root because b=-64 and there is minus in the formula too .

note: it's \(-64 \pm \sqrt{64^2 - (4)(-16)(4)}\) up there.

correct formula is
\[\Large =\frac{-b \pm \sqrt{b^2-4ac}}{2a}\]

\[\frac{ 64\sqrt{64^{2}+256} }{32}\]

you miseed plus minus sign :)

yup! simplify and you're done (i guess the editor don't have it. the latex is \pm