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If x is odd, all EXCEPT which one of the following must be o
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30 Aug 2018, 16:23
30 Aug 2018, 16:23
Expert Reply
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Question Stats:
60% (01:08) correct
40% (01:07) wrong based on 70 sessions
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If x is odd, all EXCEPT which one of the following must be odd?
(A) \(x^2 + 4x + 6\)
(B) \(x^3 + 5x + 3\)
(C) \(x^4 + 6x + 7\)
(D) \(x^5 + 7x + 1\)
(E) \(x^6 + 8x + 4\)
(A) \(x^2 + 4x + 6\)
(B) \(x^3 + 5x + 3\)
(C) \(x^4 + 6x + 7\)
(D) \(x^5 + 7x + 1\)
(E) \(x^6 + 8x + 4\)
Re: If x is odd, all EXCEPT which one of the following must be o
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31 Aug 2018, 21:56
31 Aug 2018, 21:56
Please explain how the answer is C?
Re: If x is odd, all EXCEPT which one of the following must be o
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01 Sep 2018, 15:08
01 Sep 2018, 15:08
Expert Reply
Explanation
For even and odd questions, you can either think it out logically or plug in a number. Since one choice requires raising the number to the 6th power, pick something small! Plug in x = 1:
(A) \(x^2 + 4x + 6 = 1 + 4 + 6 = 11\)
(B) \(x^3 + 5x + 3 = 1 + 5 + 3 = 9\)
(C) \(x^4 + 6x + 7 = 1 + 6 + 7 = 14\)
(D) \(x^5 + 7x + 1 = 1 + 7 + 1 = 9\)
(E) \(x^6 + 8x + 4 = 1 + 8 + 4 = 13\)
For even and odd questions, you can either think it out logically or plug in a number. Since one choice requires raising the number to the 6th power, pick something small! Plug in x = 1:
(A) \(x^2 + 4x + 6 = 1 + 4 + 6 = 11\)
(B) \(x^3 + 5x + 3 = 1 + 5 + 3 = 9\)
(C) \(x^4 + 6x + 7 = 1 + 6 + 7 = 14\)
(D) \(x^5 + 7x + 1 = 1 + 7 + 1 = 9\)
(E) \(x^6 + 8x + 4 = 1 + 8 + 4 = 13\)
