The question requires addition information. Below is how the question should be rightly stated.
Using substitution method,
We are given -------(2)
Differentiating u with respect to x,
Making dx the subject of the equation
Substituting the values of u from equation (2) and dx from equation (3) into equation (1)
substituting the value of u
I cant remember exactly but i do remember having to do this question and quizlet had the awnser