I have this differentiation problem, taken from James Stewart's Calculus Early Transcendentals, 7th Ed. Page 205, Exercise 9.
Find the derivative of the below using chain rule.
Reciprocal of the numerator and denominator will create positive exponents.
Multiply by $-2$ for our answer:
However the textbook answer is:
Where did I go wrong with my algebra? Thanks for your help.