Quadratic Word problem

Question

A toy rocket is launched form a 3m platform, at 8.2m/s. The height of the rocket is modelled by the equation h=-4.0t^2+8.1t+3 where h is the height, in metres, above the ground and t is the time, in seconds.

After how many seconds will the rocket rise to a height of 6m above the ground?

Answer 1

6 = -4.0t² + 8.1t + 3

0 = -4.0t² + 8.1t - 3

0 = 4.0t² - 8.1t + 3

 

Can you solve for t using the Quadratic Formula.