The curve has a stationary point at . What is ?

Answer and explanation

Correct answer: E.

  1. Step 1: , which is at : .
  2. Step 2: So . (The value of plays no part.)
Answer
.
Why not the others: has the wrong sign; and would come from solving (using instead of ); does not solve .

Practise more Differentiation.

Free questions with an explanation for every one, and full timed TMUA mock tests.