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JAMB Mathematics 2023 Objective — Question 36

Question 36 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2023 Objective paper, with the correct answer and a full explanation.

Find the coefficient of xy in the expansion of (x-4y)(3x+2y).

A. -10Correct
B. 14
C. 10
D. -14

Explanation

(x-4y)(3x+2y)=3x²-10xy-8y². Coefficient of xy = -10.

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