$$ K'(2)= -8.$$
Work Step by Step
Given $ K(x)=f(x^2)$, then we have $ K'(x)=2xf'(x^2)$ and hence $$ K'(2)=2(2)f'(4)=4(-2)=-8.$$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.