Subject
Bank Exam
Topic
Bangladesh Bank 2009 (AD)
If x = -1, Then –(x4+x3+x2+x) =
If x = -1, Then –(x4+x3+x2+x) =
ক)
-10খ)
-4গ)
0ঘ)
4Explanation
x = -1 so, [(-1)4 + (-1)3 + (-1)2 + (-1)] = [1 - 1 + 1 - 1] {Even number of power changes the Plus/Minus sign, but in Odd number of power the sign remains unchanged} = 0Related questions
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