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h(d)= -3.9d2+13.1d+8.7

When Alex rides his dirt bike off a ramp, his path can be modelled by, where d is the horizontal distance from the ramp and h is the height, both in metres. How far away from the ramp does he land, to the nearest tenth of a metre?

 Jul 9, 2021
 #1
avatar+35057 
+3

h(d) = 0 when he lands

 

0 = -3.9d^2 + 13 + 8.7        Quadratic Formula shows d = 3.9 meters

 Jul 9, 2021
 #2
avatar+143 
+2

Graphing the equation on a ti or Desmos is simplest. to the nearest tenth, it is 3.9

 Jul 9, 2021

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