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What is the value of (x - 1)(y + 1) ? (1) x + y = 4 (2) xy = 3

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Joined: 02 Sep 2009
Posts: 53020
What is the value of (x - 1)(y + 1) ? (1) x + y = 4 (2) xy = 3  [#permalink]

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New post 05 Jul 2018, 23:15
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

60% (01:42) correct 40% (01:33) wrong based on 107 sessions

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Re: What is the value of (x - 1)(y + 1) ? (1) x + y = 4 (2) xy = 3  [#permalink]

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New post 05 Jul 2018, 23:36
Bunuel wrote:
What is the value of (x - 1)(y + 1) ?

(1) x + y = 4
(2) xy = 3


Individually insufficient.

combining, we have two values of both x and y for which (x - 1)(y + 1) will have two values.

hence, insufficient.
Ans (E)
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Re: What is the value of (x - 1)(y + 1) ? (1) x + y = 4 (2) xy = 3  [#permalink]

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New post 06 Jul 2018, 11:00
E

individual statements are insufficient.

we'll get two values of x and y
x =1,3 y=3,1

so the binomial has 2 values

so E
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Re: What is the value of (x - 1)(y + 1) ? (1) x + y = 4 (2) xy = 3  [#permalink]

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New post 24 Dec 2018, 00:38
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What is the value of (x - 1)(y + 1) ? (1) x + y = 4 (2) xy = 3  [#permalink]

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New post 24 Dec 2018, 02:09
Bunuel wrote:
What is the value of (x - 1)(y + 1) ?

(1) x + y = 4
(2) xy = 3



#1: x+y= 4

x,y can be (1,3) ( 2,2,) (4,0)

insufficient

#2 xy=3
3,1 , 1/3*9 ... in sufficient

on combining we get (1,3 ) as the only number which would be sufficient .. IMO C


answer is C over E so because definite values of x & y are not sure and we get two value s in (x - 1)(y + 1) on substitution of (3,1) or (1,3)
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What is the value of (x - 1)(y + 1) ? (1) x + y = 4 (2) xy = 3   [#permalink] 24 Dec 2018, 02:09
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