JAMB Mathematics 2020 Objective — Question 10
Question 10 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2020 Objective paper, with the correct answer and a full explanation.
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What factor is common to all of x^2-x, 2x^2+x-1 and x^2-1?
- A. x
- B. 2x-1
- C. x-1
- D. x+1Correct
Explanation
x^2-x=x(x-1). 2x^2+x-1=(2x-1)(x+1). x^2-1=(x+1)(x-1). The common factor across all three is x+1.
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