Question

I do not understand how my answer is wrong, could somebody please explain me.

Please see attached.

Answer 1

See, you have \[v^2\]on the denumerator, so it is the second box should be -2, not 2.

Answer 2

but why is it -2?

Answer 3

\[v^{-a}=1/v^{a}\]

Answer 4

oh yes! as it is in the denominator