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Post-UTME Mathematics 2009 Objective — Question 2

Question 2 of 15 from the Post-UTME Screening (Post-UTME) Mathematics 2009 Objective paper, with the correct answer and a full explanation.

What must be added to the expression x²-18x to make it a perfect square?

A. 9
B. 36
C. 72
D. 81Correct

Explanation

Completing the square: (18/2)²=81.

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