JAMB Mathematics 2008 Objective — Question 39

Question 39 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2008 Objective paper, with the correct answer and a full explanation.

Find the minimum value of the function y = x(1+x)

A. -1/4Correct
B. -1/2
C. 1/4
D. 1/2

Explanation

y=x+x^2. dy/dx=1+2x=0 at the minimum point. x=-1/2. y=(-1/2)(1-1/2)=(-1/2)(1/2)=-1/4.

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