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# What is the value of x? (1) 4x^2- 4x+1=0

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Tuck School Moderator
Status: Valar Dohaeris
Joined: 31 Aug 2016
Posts: 301
GMAT 1: 700 Q49 V37
What is the value of x? (1) 4x^2- 4x+1=0  [#permalink]

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07 Oct 2018, 02:59
1
00:00

Difficulty:

25% (medium)

Question Stats:

72% (01:07) correct 28% (01:24) wrong based on 62 sessions

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What is the value of x?

(1) $$4x^2- 4x+1=0$$
(2) $$4x^2-1=0$$

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examPAL Representative
Joined: 07 Dec 2017
Posts: 1140
Re: What is the value of x? (1) 4x^2- 4x+1=0  [#permalink]

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07 Oct 2018, 03:03
PeepalTree wrote:
What is the value of x?

(1) $$4x^2- 4x+1=0$$
(2) $$4x^2-1=0$$

As all we're given are equations, we'll go for simplification.
This is a Precise approach.

(1) This simplifies to (2x-1)^2 = 0 meaning that x = 1/2.
Sufficient.

(2) This simplifies to x^2 = 1/4 meaning that x = 1/2 or x = -1/2
Insufficient.

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Re: What is the value of x? (1) 4x^2- 4x+1=0   [#permalink] 07 Oct 2018, 03:03
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