SOLUTION: In 1981, Vladamir Poliakov (USSR) set a world record of 19ft 3/4 in for the pole vault. To reach that height, Poliakov obtained a speed of approximately 36 feet per second on the

Question 350996: In 1981, Vladamir Poliakov (USSR) set a world record of 19ft 3/4 in for the pole vault. To reach that height, Poliakov obtained a speed of approximately 36 feet per second on the runway. The formula h=-16t2 + 36t gives his height t seconds after leaving the ground.
a. use the formula to find the exact values for t for which his height was 18 feet.

Answer by nyc_function(2741) (Show Source): You can put this solution on YOUR website!
Let h = 18 and solve for t.

h = -16t^2 + 36t

18 = -16t^2 + 36t

Bring everything to the left and set quadratic equation to zero.

16t^2 - 36t + 18 = 0

Use the quadratic formula to find your values for t.
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