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e-GMAT Representative V
Joined: 04 Jan 2015
Posts: 3074
Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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15 00:00

Difficulty:   35% (medium)

Question Stats: 68% (01:38) correct 32% (01:54) wrong based on 252 sessions

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Solving inequalities- Number Line Method - Practice Question #3

Find the range of values of x such that $$\frac{(x-3)(x-4)}{(x+1)(x+2)}>0$$

A. x > 4
B. (-1 ,4)
C. (-2, -1) U (3,4)
D. (-1,3) U (4, +inf)
E. (-inf, -2) U (-1, 3) U (4, +inf)

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Originally posted by EgmatQuantExpert on 23 Aug 2018, 04:29.
Last edited by Bunuel on 16 Dec 2018, 10:01, edited 3 times in total.
e-GMAT Representative V
Joined: 04 Jan 2015
Posts: 3074
Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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Solution

Given:
An inequality, $$\frac{(x-3)(x-4)}{(x+1)(x+2)}>0$$

To find:
The range of x, that satisfies the above inequality

Approach and Working:
The first step is to multiply the inequality by (x+1)^2 and (x+2)^2 on both sides
Thus, we get,
$$\frac{(x+1)^2 (x+2)^2 (x-3)(x-4))}{((x+1)(x+2)}>0$$
Which implies, (x + 1) * (x + 2) * (x - 3) * (x - 4) > 0, and x ≠ {-1, -2}, since the denominator cannot be zero.
The zero points of this inequality are, x = -2, x = -1, x = 3, x = 4
Plot these points on the number line.
Since, 4 is the greatest among all, the inequality will be positive, for all the points to the right of 4, on the number line
And, it is negative, in the region, between 3 and 4
It is again positive in the region, between -1 and 3
And, it is again negative in the region, between -2 and -1
And, it is positive for all the values less than -2 Therefore, the range of x is x > 4 and -1 < x < 3 and x < -2

Hence, the correct answer is option E.

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Originally posted by EgmatQuantExpert on 23 Aug 2018, 04:32.
Last edited by EgmatQuantExpert on 27 Aug 2018, 02:10, edited 2 times in total.
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Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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EgmatQuantExpert wrote:
Solving inequalities- Number Line Method - Practice Question #3

Find the range of values of x such that $$\frac{((x-3)(x-4))}{((x+1)(x+2))>0}$$

A. x > 4
B. (-1 ,4)
C. (-2, -1) U (3,4)
D. (-1,3) U (4, +inf)
E. (-inf, -2) U (-1, -3) U (4, +inf)

$$\frac{((x-3)(x-4))}{((x+1)(x+2))>0}$$

using wavy curve method:-

x<-2 or -1<x<3 or x>4.

So, ranges of x in interval form: (-inf, -2) U (-1, -3) U (4, +inf)

Ans. (E)
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PKN

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Location: Iran (Islamic Republic of)
Concentration: Accounting, Finance
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Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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E. (-inf, -2) U (-1, -3) U (4, +inf)

-3 must be changed to 3
VP  D
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Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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soleimanian wrote:
E. (-inf, -2) U (-1, -3) U (4, +inf)

-3 must be changed to 3

Hi soleimanian,
You have pointed out correctly.

Hi EgmatQuantExpert,
Hope you will do the needful.
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PKN

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e-GMAT Representative V
Joined: 04 Jan 2015
Posts: 3074
Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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Hey soleimanian,
Apology for the typo.

We have updated the option.
Regards,
Ashutosh
e-GMAT
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Director  V
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Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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1
EgmatQuantExpert wrote:
Solving inequalities- Number Line Method - Practice Question #3

Find the range of values of x such that $$\frac{((x-3)(x-4))}{((x+1)(x+2))>0}$$

A. x > 4
B. (-1 ,4)
C. (-2, -1) U (3,4)
D. (-1,3) U (4, +inf)
E. (-inf, -2) U (-1, 3) U (4, +inf)

| Next Question

To read the article: Solving inequalities- Number Line Method

To read all our articles:Must Read articles to reach Q51 Dear Moderator,
Can we format the question properly, seems as though only the denominator, is > 0, Thank you.
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- Stne
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Joined: 02 Sep 2009
Posts: 58453
Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0  [#permalink]

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stne wrote:
EgmatQuantExpert wrote:
Solving inequalities- Number Line Method - Practice Question #3

Find the range of values of x such that $$\frac{((x-3)(x-4))}{((x+1)(x+2))>0}$$

A. x > 4
B. (-1 ,4)
C. (-2, -1) U (3,4)
D. (-1,3) U (4, +inf)
E. (-inf, -2) U (-1, 3) U (4, +inf)

| Next Question

To read the article: Solving inequalities- Number Line Method

To read all our articles:Must Read articles to reach Q51 Dear Moderator,
Can we format the question properly, seems as though only the denominator, is > 0, Thank you.

______________
Done. Thank you.
_________________ Re: Find the range of values of x such that ((x-3)(x-4))/((x+1)(x+2))>0   [#permalink] 16 Dec 2018, 10:01
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