Try another version of this question Get help: Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Find the derivative of `f(x)=``10x^9+5x^8` .
`f'(x)=`
Be sure your variables match those in the question `90 x^(8) + 40 x^(7)`