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What is the value of 4x^2 + 5x – 2 ?

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Joined: 02 Sep 2009
Posts: 49303
What is the value of 4x^2 + 5x – 2 ?  [#permalink]

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02 Oct 2017, 23:51
00:00

Difficulty:

65% (hard)

Question Stats:

48% (01:09) correct 52% (00:55) wrong based on 33 sessions

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What is the value of 4x^2 + 5x – 2 ?

(1) 4x^2 + 4x + 1 = 0
(2) x(4x + 5) = 2

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Re: What is the value of 4x^2 + 5x – 2 ?  [#permalink]

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03 Oct 2017, 00:13
Bunuel wrote:
What is the value of 4x^2 + 5x – 2 ?

(1) 4x^2 + 4x + 1 = 0
(2) x(4x + 5) = 2

Question : 4x^2 + 5x – 2 ?

Question : 4x^2 + 5x +1 - 3 ?

Question : (4x+1)*(x +1) - 3 = ?

Statement 1: 4x^2 + 4x + 1 = 0

4x^2 + 5x – 2 = 4x^2 + 4x +1 +x – 3 = 0+x-3 = x-3

Also, 4x^2 + 4x + 1 = 0
i.e. (2x+1)^2 = 0
i.e. x = -1/2
hence,
x - 3 = -3.5
SUFFICIENT

Statement 2: x(4x + 5) = 2

i.e. 4x^2 + 5x = 2
i.e. 4x^2 + 5x - 2 = 0
SUFFICIENT

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Re: What is the value of 4x^2 + 5x – 2 ? &nbs [#permalink] 03 Oct 2017, 00:13
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