Subject
Bank Exam
Topic
জনতা ব্যাংক লিমিটেড আরসি (রুরাল ক্রেডিট) - ২৭.১০.২০২৩
If x is an integer, then which of the following statements about x2- x - 1 is true?
If x is an integer, then which of the following statements about x2- x - 1 is true?
ক)
It is always oddখ)
It is always even.গ)
It is always positive.ঘ)
It is even when x is even and odd when x is oddExplanation
If x = 1, x 2 - x - 1 = 1 2 - 1 - 1 = - 1 so, the value can be negative. x = even, x 2 will be even, x 2 - x will also be even, x 2 - x - 1 will be odd. x = odd, x 2 will be odd, x 2 - x will also be even, x 2 - x - 1 will be odd. So, It is always odd.Related questions
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