Question

h(x)=(t+1)^1/2

k(-2)=2
k(2)=3
k'(-2)=9
k'(2)=10

find derivative h(k(1))
h(k(x)) at x=2

Answer 1

find derivative h(k(2))

Answer 2

I think you have garbled the problem.
How can h(x) = √(t+1) ?
Fix that, and then you can use the chain rule.