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
If ` f(x) = \frac ( 4 x + 4 ) ( 5 x + 4 ), `, find:
` f'( x ) ` =
Be sure your variables match those in the question `-4/(5 x +4)^2`