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Value in quadratic equation

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Manager
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Joined: 22 Feb 2006
Posts: 92
Value in quadratic equation [#permalink]

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New post 17 Jun 2009, 18:09
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

100% (02:08) correct 0% (00:00) wrong based on 2 sessions

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Please, explain why. Thank you.

Q5:
If (y+3)(y-1) – (y-2)(y-1) = r(y-1), what is the value of y?
(1) r2 = 25
(2) r = 5

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

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Manager
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Joined: 16 Apr 2009
Posts: 212
Schools: Ross
Re: Value in quadratic equation [#permalink]

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New post 18 Jun 2009, 07:32
Quote:
Q5:
If (y+3)(y-1) – (y-2)(y-1) = r(y-1), what is the value of y?
(1) r2 = 25
(2) r = 5


(y+3)(y-1) – (y-2)(y-1) ==>(y-1)((y+3)-(y-2))==>(y-1)(y+3-y+2)
(y-1)5=r(y-1)

Hence Both A and B alone are suff.

Hence D
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Re: Value in quadratic equation [#permalink]

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New post 18 Jun 2009, 08:19
Seems to be a weird Q. Source Please?

You can actually derive r=5 from the given eq

2 does not add any thing

1 gives 2 more r values

Together also does not help. Hence E

--== Message from GMAT Club Team ==--

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If you would like to discuss this question please re-post it in the respective forum. Thank you!

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Re: Value in quadratic equation   [#permalink] 18 Jun 2009, 08:19
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