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erma4kov [3.2K]
3 years ago
14

The function f(t) = -18t2 + 42t + 36 represents the height of the path traced by an airborne flying disc, where t is the time in

seconds. How many seconds will it take the flying disc to complete its path?
Mathematics
1 answer:
Ratling [72]3 years ago
5 0
To complete path means the disc lands on the ground, the height f(t)=0
-18t²+42t+36=0
simplify by dividing -6: 3t²-7t-6=0
facotor: (t-3)(3t+2)=0
t=3 or t=-2/3 (discard this negative one because time cannot be negative. 
so the answer is 3 seconds. 
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