16Hit1600
Advanced MathEasyEvaluating a quadratic model

Advanced Math practice question

The height, in metres, of a drone t seconds after it is launched is modelled by h(t) = 4t − t². What is the drone's height, in metres, 3 seconds after launch?

Answer: 3

h(3) = 4(3) − 3² = 12 − 9 = 3.

Common wrong answers

If you answered 6
6 is 4(3) − 3 × 2 or a similar slip; t² is 9.
If you answered 9
9 is 3² alone; the 4t term contributes 12.
If you answered 21
21 is 12 + 9, adding t² instead of subtracting it.

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