Answer:
y= 3t^4-6t^2-5t+9
dy/dt=12t^3-12t-5
d^2 y/d t^2= 36t^2-12
at t = -1
d^2 y/d t^2= 36(-1)^2-12
d^2 y/d t^2= 36-12
d^2 y/d t^2= 24
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Verified answer
Answer:
y= 3t^4-6t^2-5t+9
dy/dt=12t^3-12t-5
d^2 y/d t^2= 36t^2-12
at t = -1
d^2 y/d t^2= 36(-1)^2-12
d^2 y/d t^2= 36-12
d^2 y/d t^2= 24