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xxTIMURxx [149]
3 years ago
6

How would you do this problem?

Mathematics
2 answers:
Vlad1618 [11]3 years ago
6 0

Answer:

6 seconds

Step-by-step explanation:

First: equalize the equation to zero

f(t) = -5t² + 20t + 60

-5t² + 20t + 60 = 0

Second: find its roots

-5(t² - 4t - 12) = 0

-5 (t - 6)(t + 2) = 0

t - 6 = 0 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: t + 2 = 0 \\ t = 6 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: t =  - 2

Time can't be negative so the answer is: it takes 6 seconds to hit the ground

sweet [91]3 years ago
3 0
F(x)=-5t^2+20t+60
Divide everything by -5
f(x)=t^2-4t-12
(t-6)(t+2)
Set it up to zero
t-6=0. t+2=0
t=6. t=-2
Since you can’t have negative seconds, the answer is 6 seconds
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