3x^2 + 2x - 8 = : GMAT Problem Solving (PS)
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# 3x^2 + 2x - 8 =

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3x^2 + 2x - 8 = [#permalink]

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13 May 2012, 21:53
00:00

Difficulty:

25% (medium)

Question Stats:

75% (02:03) correct 25% (01:07) wrong based on 211 sessions

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3x^2 + 2x - 8 =

A. (3x-4)(x-2)
B. (3x-4)(x+2)
C. (3x-4)(x-2)
D. (3x-2)(x+4)
E. none of above
[Reveal] Spoiler: OA
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Re: 3x^2 + 2x - 8 = [#permalink]

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13 May 2012, 22:15
3x^2 + 2x - 8
= 3x^2 + 6x - 4x - 8
= 3x (x + 2) - 4 (x+2)
= (3x-4) (x+2)

Option B
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Re: 3x^2 + 2x - 8 = [#permalink]

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13 May 2012, 23:09
malkov wrote:
3x^2 + 2x - 8 =

A. (3x-4)(x-2)
B. (3x-4)(x+2)
C. (3x-4)(x-2)
D. (3x-2)(x+4)
E. none of above

Hope it helps.
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Re: 3x^2 + 2x - 8 = [#permalink]

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14 May 2012, 00:05
1
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3x^2 + 2x - 8

X1*X2=-8/3
X1+X2=-2/3

Only option B satisfies these parameters
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Re: 3x^2 + 2x - 8 = [#permalink]

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05 Jul 2015, 02:49
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3x^2 + 2x - 8 = [#permalink]

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21 Jan 2016, 06:11
1. just open the brackets. A is out, B is in. 30 secs.

2. factoring box

a. 3x^2 + 2x - 8 -> mulptiply a and c = 3*-8 = -24
b. factors of -24 that add up to b (i.e. 2) are 6 and -4 (note that the larger factor should be positive because b is positive, one of the factors is negative)
c. arrange the box as below and find common factors in the 2 vertical and 2 horizontal lines. form equation. of (3x-4)(x+2)
Attachments

box.jpg [ 7.22 KiB | Viewed 1537 times ]

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3x^2 + 2x - 8 =   [#permalink] 21 Jan 2016, 06:11
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