If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? Use the equation h = -16t2 + 64t + 4.

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If a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? Use the equation h = -16t2 + 64t + 4.

Mathematics
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when the ball hits the ground h will = 0 so form an equation and solve for t
So far I have this 64 +/- sqrt 3840 over 32. But I don't know what to do after that
make it easier by taking out -4 -4(4t^2 - 16t - 1) = 0 now apply quadratic formula to the expression in the parentheses t =[ 16 +- sqrt(256 - 4*4 * -1) ] / 8

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Other answers:

t = (16 + 16.49) / 8 (neglect the negative root)
im confused
haven't you used the quadratic formula before?
yes but I didn't get what you got
i applied it to 4x^2 - 16x - 1 = 0
- smaller numbers
oh ok
i divide through by -4 to make it easier
this equation will have the same roots as the bigger one
so the answer I got was 16+/- sqrt 17 over 2 is that what you got?
(16 + sqrt272 ) / 8 = 4.06 secs
my answer has to be in the quadratic formula
oh ok so that's (16 + sqrt(16*17) ) / 8 = 16 + 4*sqrt17 ----------- 8 = 2 + 0.5 sqrt17
ok thank you
yw

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