SOLUTION: Heey, I just can't figure out how to answer this question! I've tried things, but then I got stuck. Can someone please hep me? Thanx A projectile is fired vertically upwards

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Question 556326: Heey, I just can't figure out how to answer this question!
I've tried things, but then I got stuck. Can someone please hep me?
Thanx
A projectile is fired vertically upwards and its height in meters after t seconds is given by the formula h=40t-8t^2
Find the time taken by the projectile to first reach a height of 48 meters.
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
48 = 40t - 8t^2

6 = 5t - t^2

0 = t^2 - 5t + 6

0 = (t - 3)(t - 2)

t = 3 AND t = 2