If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)? : GMAT Problem Solving (PS)
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If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)?

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Intern
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Joined: 03 Jun 2011
Posts: 8
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Kudos [?]: 3 [0], given: 2

If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)? [#permalink]

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New post 08 Jun 2011, 08:35
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If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)?

A. -14
B. -4
C. 0
D. 4
E. 14
[Reveal] Spoiler: OA
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Kudos [?]: 1670 [0], given: 376

Re: If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)? [#permalink]

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New post 08 Jun 2011, 08:46
pritis wrote:
If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)?
Choices
A -14
B -4
C 0
D 4
E 14


Even power of negative=+ve
Odd power of negative=-ve

\(a^2=(-1)^2=1\)
\(a^3=(-1)^3=-1\)
\(a^4=(-1)^4=1\)
\(a^5=(-1)^5=-1\)

Ans: "C"

pritis:
Please use ^ to denote power.
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Re: If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)?   [#permalink] 08 Jun 2011, 08:46
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If a = -1, what is the value of –(a^2 + a^3 + a^4 + a^5)?

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