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d(d2 - 2d + 1)

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GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4721
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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d(d2 - 2d + 1) [#permalink]  20 May 2018, 14:00
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Question Stats:

57% (00:33) correct 42% (01:44) wrong based on 7 sessions
 Quantity A Quantity B $$d(d^2 - 2d + 1)$$ $$d(d^2 - 2d) + 1$$

A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
[Reveal] Spoiler: OA

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Joined: 07 Jan 2018
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Kudos [?]: 466 [0], given: 83

Re: d(d2 - 2d + 1) [#permalink]  23 May 2018, 02:01
Expand qty A:

$$d^3 - 2d^2 +d$$
Expand qty B:

$$d^3 -2d^2 + 1$$

Adding $$-2d^2$$ on both sides and then after subtracting $$d^3$$ on both sides reduces the quantities to:

d and 1

d could be anything
option D
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This is my response to the question and may be incorrect. Feel free to rectify any mistakes

Re: d(d2 - 2d + 1)   [#permalink] 23 May 2018, 02:01
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