Science:Math Exam Resources/Courses/MATH110/April 2019/Question 05 (c)/Hint 1

Recall that a function f(x) is concave down at all points where its second derivative is negative; that is, f ′′(x) < 0.

Computing f ′(x) is straightforward, but computing f ′′(x) will require more effort. The final expression is not that messy!