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WAEC Mathematics 2018 Objective — Question 12

Question 12 of 50 from the West African Examinations Council (WAEC) Mathematics 2018 Objective paper, with the correct answer and a full explanation.

A curve is such that when y = 0, x = −2 or x = 3. Find the equation of the curve.

A. y=x²−5x−6
B. y=x²+5x−6
C. y=x²+x−6
D. y=x²−x−6Correct

Explanation

Roots −2 and 3 give (x+2)(x−3)=0 → x²−x−6=0, so y=x²−x−6.

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