SOLUTION: please help me solve this problem: A rocket is fired straight up from the ground at a time t= 0 with an initial speed of 560 feet per second. The rocket's distance of h feet above

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Question 319110: please help me solve this problem: A rocket is fired straight up from the ground at a time t= 0 with an initial speed of 560 feet per second. The rocket's distance of h feet above the ground t seconds later h=560t-16t^2.What time will the rocket be 3, 136 feet above the ground?

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
h=560t-16t%5E2=3136
16t%5E2-560t%2B3136=0
t%5E2-35t%2B196=0
%28t-28%29%28t-7%29=0
Two solutions:
t-7=0
highlight%28t=7%29<--- When the rocket is on its way up.
.
.
.
t-28=0
highlight%28t=28%29<--- When the rocket is on its way down.