Post-UTME Mathematics 2006 Objective — Question 5
Question 5 of 10 from the Post-UTME Screening (Post-UTME) Mathematics 2006 Objective paper, with the correct answer and a full explanation.
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Multiply x²+x+1 by x²-x+1
- A. x⁴+3x²+x+1
- B. x⁴+x²+1Correct
- C. x⁴+4x²-6x
- D. x⁴-6x²-4x+1
Explanation
(x²+x+1)(x²-x+1) = (x²+1)²-x² = x⁴+2x²+1-x² = x⁴+x²+1.
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