Try another version of this question If ` f(x) = x^2/(3 + 9 x) `, find ` f'( x ) `.
Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question `((3+9 x)(2x)-(x^2)(9))/(3+9 x)^2`