f'(x)=0. i.e the derivative is 0.
Work Step by Step
f(x)=-9 can be rewritten as f(x)=-9$*$x$^0$ since x$^0$=1. Then using the power rule f'(x)=0$*$-9x$^0$=0. You can take this to be a general rule: The derivative of a constant is 0.
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.