- #1

rcmango

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## Homework Statement

Determine whether the curve x = 3t^2, y = e^2t+1 is concave up or concave down at the point (3, e^3)

thanks for any help with this one.

## Homework Equations

## The Attempt at a Solution

know i need to take the double derivative. Also that would be 6

and 4e^2t+1

what point do i put back into the double derivative. Also, do I use 3 and e^3? they represent x, y, so do they plug into the equation appropriately, or back into t? please help.