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(2 + x)(2 + y) – (2 + x) – (2 + y) =

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(2 + x)(2 + y) – (2 + x) – (2 + y) = [#permalink]

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New post 31 May 2017, 01:40
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

98% (00:45) correct 3% (00:56) wrong based on 51 sessions

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Kudos [?]: 128870 [0], given: 12183

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Re: (2 + x)(2 + y) – (2 + x) – (2 + y) = [#permalink]

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New post 31 May 2017, 04:14
(2+x)(2+y) = 4 + 2x + 2y + xy

Thus, (2+x)(2+y)–(2+x)–(2+y) = 4 + 2x + 2y + xy - 2 -x -2 - y = (x + y + xy)

Hence E answer

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New post 31 May 2017, 07:21
We need to find out the value of this expression
(2+x)(2+y)–(2+x)–(2+y)
Substituting values x=y=1

We get 9 - 3 - 3 = 3

Of the available answer options, only Option E gives us the same value as the expression.
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New post 01 Jun 2017, 17:28
Bunuel wrote:
\((2 + x)(2 + y) – (2 + x) – (2 + y) =\)

(A) 2y
(B) xy
(C) x + y
(D) x – y
(E) x + y + xy


Let’s simplify the given expression:

(2 + x)(2 + y) - (2 + x) - (2 + y)

4 + 2x + 2y + yx - 2 - x - 2 - y

x + y + yx

Answer: E
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New post 17 Jul 2017, 10:44
Bunuel wrote:
\((2 + x)(2 + y) – (2 + x) – (2 + y) =\)

(A) 2y
(B) xy
(C) x + y
(D) x – y
(E) x + y + xy



ANSWER:
=====

All we need to do is simplify this expression.

Multiply (2 + x)(2 + y) using FOIL. [First Outer Inner Last] and simplify

(2 + x)(2 + y) - (2 + x) - (2 + y)
4 + 2x + 2y + yx - 2 - x - 2 - y
x + y + yx


The Answer is E
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New post 27 Aug 2017, 04:05
took (2+x) common from the first two elements

so (2+x)(2+y) -(2+x)-(2+y)= (2+x) ((2+y)-1) -(2+y)
=(2+x)(1+y)-(2+y)
=2+2y+x+xy-2-y
=x+y+xy

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Re: (2 + x)(2 + y) – (2 + x) – (2 + y) =   [#permalink] 27 Aug 2017, 04:05
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