given the equation h=144t-16t

^{2}h=hight

t=seconds

When will the rocket reach the height of 230 feet?

When will the rocket be back on the ground?

given the equation h=144t-16t^{2}

h=hight

t=seconds

When will the rocket reach the height of 230 feet?

When will the rocket be back on the ground?

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Bronx, NY

h = 144t - 16t^2

h = 230

230 = 144t - 16t^2

-230 + 144t - 16t^2 = 0

16t^2 -144t + 230 = 0

8t^2 - 72t + 115 = 0

t = (72 +/- (5084 - 3680)^.5)/16 =(72 +/- 6(39)^.5)/16 = 4.5 +/- (3/8)(39)^.5 = 6.84 seconds & 2.16 seconds

At these two times, the rocket is at a height 230 feet above the ground.

144t - 16t^2 = 0

t(144 - 16t) = 0

144 - 16t = 0

t = 9

At 9 seconds, the rocket comes back to the ground.

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