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For all x and y, (x + 1)(y + 1) – x – y =

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V
Joined: 02 Sep 2009
Posts: 53801
For all x and y, (x + 1)(y + 1) – x – y =  [#permalink]

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New post 14 Jan 2019, 03:04
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

95% (00:44) correct 5% (03:19) wrong based on 27 sessions

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P
Joined: 31 Oct 2013
Posts: 1273
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: For all x and y, (x + 1)(y + 1) – x – y =  [#permalink]

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New post 14 Jan 2019, 03:22
Bunuel wrote:
For all x and y, (x + 1)(y + 1) – x – y =

A. xy – x – y + 1
B. xy + 1
C. –x – y + 1
D. x^2 + y^2 – 1
E. 1



(x + 1)(y + 1) – x – y

= xy + x + y + 1 - x - y

=xy + 1

B is the correct answer.
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Re: For all x and y, (x + 1)(y + 1) – x – y =  [#permalink]

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New post 14 Jan 2019, 04:12
xy + x + y + 1 - x - y

xy + 1

OPTION: B
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Re: For all x and y, (x + 1)(y + 1) – x – y =  [#permalink]

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New post 14 Jan 2019, 04:13
Bunuel wrote:
For all x and y, (x + 1)(y + 1) – x – y =

A. xy – x – y + 1
B. xy + 1
C. –x – y + 1
D. x^2 + y^2 – 1
E. 1


solve te expression
we get xy+1
IMO B
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Re: For all x and y, (x + 1)(y + 1) – x – y =   [#permalink] 14 Jan 2019, 04:13
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