JAMB Mathematics 2017 Objective — Question 27

Question 27 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2017 Objective paper, with the correct answer and a full explanation.

Find the turning points of the function y = x³ - x² - x.

A. A. 1, -1/3
B. B. -1, 1/-3
C. C. -1, 1/3
D. D. 1, 1/3Correct

Explanation

dy/dx = 3x²-2x-1 = 0 gives x = 1 or x = -1/3; substituting gives the turning points.

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