SIMPLE Pre-cal question help!
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SIMPLE Pre-cal question help!

[From: ] [author: ] [Date: 12-09-20] [Hit: ]
That should give you the correct answer, assuming you performed the order of operations correctly. If you give me the numbers, I can gladly solve the problem for you.......
Brady throws a ball into the air. The equation
s = −16t^2 + 63t + 4
gives the height of the ball s (in feet) t seconds after throwing it. When will the ball hit the ground after he throws it?

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We want to know when it hits the ground, so when s = 0

0 = -16t^2 + 63t + 4

Factor it:
0 = -(t-4)(16t+1)

t = 4
t = -1/16

We only want the positive time.

so after 4 seconds

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Pull out the negative from the whole equation:

s = -(16t^2-63t-4)

Since 16*-4+1=-63, your factoring would be :

s = -(16t+1)(t-4)

Since you height s, is at 0, put s=0

0= -(16t+1)(t-4)
t= -1/16 or t=4,

since you cannot have the negative time, t= -1/16 is dismissable, thus, the time when the ball will hit the ground is t=4s

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Plug t into the equation and solve for s. That should give you the correct answer, assuming you performed the order of operations correctly. If you give me the numbers, I can gladly solve the problem for you.
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