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For all numbers s and t, the operation * is defined by s*t

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Joined: 29 Jan 2014
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For all numbers s and t, the operation * is defined by s*t [#permalink]

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New post 18 Feb 2014, 01:32
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Question Stats:

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For all numbers s and t, the operation * is defined by s*t = (s - 1)(t + 1). If (-2)*x = -12, then x =

(A) 2
(B) 3
(C) 5
(D) 6
(E) 11

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/for-all-numb ... 67915.html
[Reveal] Spoiler: OA

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Last edited by Bunuel on 29 Apr 2017, 03:15, edited 2 times in total.
Renamed the topic, edited the question, added the OA and moved to PS forum.
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Re: For all numbers s and t, the operation * is defined by s*t [#permalink]

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New post 18 Feb 2014, 01:47
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Expert's post
For all numbers s and t, the operation * is defined by s*t = (s - 1)(t + 1). If (-2)*x = -12, then x =

(A) 2
(B) 3
(C) 5
(D) 6
(E) 11

Since \(s*t = (s - 1)(t + 1)\), then \((-2)*x = (-2-1)(x+1)=-3(x+1)\).

So, we are given that \(-3(x+1)=-12\) --> \(x+1=4\) -> \(x=3\).

Answer: B.

Hope it's clear.

P.S. Please read and follow: rules-for-posting-please-read-this-before-posting-133935.html Pay attention to rules 2, 3, 7 and 10. Thank you.
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Intern
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Joined: 29 Jan 2014
Posts: 28
GMAT 1: 510 Q36 V26
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Kudos [?]: 4 [0], given: 52

Re: For all numbers s and t, the operation * is defined by s*t [#permalink]

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New post 18 Feb 2014, 02:23
Thanks Bunuel

Will keep the rules in mind.
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Re: For all numbers s and t, the operation * is defined by s*t [#permalink]

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New post 29 Apr 2017, 02:53
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This question has been discussed here: https://gmatclub.com/forum/for-all-numb ... 67915.html
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Kudos [?]: 106323 [0], given: 11621

Re: For all numbers s and t, the operation * is defined by s*t [#permalink]

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New post 29 Apr 2017, 03:14
Re: For all numbers s and t, the operation * is defined by s*t   [#permalink] 29 Apr 2017, 03:14
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For all numbers s and t, the operation * is defined by s*t

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