If y 3t3 2t2 - 7t 3 find frac dy dt at t -1 - JAMB Mathematics 1994 Question
If y = 3t3 + 2t2 - 7t + 3, find (\frac{dy}{dt}) at t = -1
A
-1
B
1
C
-2
D
2
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Correct Option: C
y = 3t3 + 2t2 - 7t + 3
(\frac{dy}{dt}) = 9t2 + 4t - 7
When t = -1
(\frac{dy}{dt}) = 9(-1)2 + 4(-1) - 7
= 9 - 4 -7
= 9 - 11
= -2
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