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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
If a = 1 and b = -2, then (2a^2 + b)(x + y) + (a + b)(x - y) =
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24 Jan 2023, 01:51
24 Jan 2023, 01:51
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Question Stats:
70% (00:59) correct
30% (02:59) wrong based on 10 sessions
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If \(a = 1\) and \(b = -2\), then \((2a^2 + b)(x + y) + (a + b)(x - y) =\)
(A) 0
(B) 2x
(C) y - x
(D) x - y
(E) x + y
(A) 0
(B) 2x
(C) y - x
(D) x - y
(E) x + y
Re: If a = 1 and b = -2, then (2a^2 + b)(x + y) + (a + b)(x - y) =
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25 Jan 2023, 09:51
25 Jan 2023, 09:51
Expert Reply
\(\left( 2a^{2\; }+\; b \right)\left( x+y \right)\; +\; \left( a\; +\; b \right)\left( x\; -\; y \right)\;\)
\(=\; \left( 2-2 \right)\left( x+y \right)\; -1\left( x-y \right)\;\)
\(=\; o\left( x+y \right)\; -\; x+y\;\)
\(=\; y-x\)
\(Answer\; \mbox{C}\)
\(=\; \left( 2-2 \right)\left( x+y \right)\; -1\left( x-y \right)\;\)
\(=\; o\left( x+y \right)\; -\; x+y\;\)
\(=\; y-x\)
\(Answer\; \mbox{C}\)
Re: If a = 1 and b = -2, then (2a^2 + b)(x + y) + (a + b)(x - y) =
[#permalink]
13 Apr 2024, 03:01
13 Apr 2024, 03:01
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Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
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