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JAMB Mathematics 2007 Objective — Question 14

Question 14 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2007 Objective paper, with the correct answer and a full explanation.

The graph above (a cubic curve crossing the x-axis at x=-2, -1 and 1) is represented by

A. y=x^3-4x+2
B. y=x^3-3x-2
C. y=x^3+2x^2-x-2Correct
D. y=x^3-4x^2+5x-2

Explanation

The curve's roots are x=-2,-1,1, so y=(x+2)(x+1)(x-1) = x^3+2x^2-x-2.

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