JAMB Mathematics 2021 Objective — Question 1

Question 1 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

1. The minimum point on the curve y = x² - 6x + 5 is at (a) -3,4 (b) 3,-4 (c) 1.5,4 (d) 2,3

A. -3,4
B. 3,-4Correct
C. 1.5,4
D. 2,3

Explanation

dy/dx = 2x - 6. At the minimum point, dy/dx = 0, so 2x - 6 = 0, x = 3. Then y = 3² - 6(3) + 5 = -4. Minimum point is (3, -4).

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