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If x is an integer and |2x + 3| ≤ 12 then which of the following must

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If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 18 Oct 2018, 23:07
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A
B
C
D
E

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If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post Updated on: 20 Oct 2018, 20:52
1
1
Bunuel wrote:
If x is an integer and \(|2x+3|≤12\), then which of the following must be true?

A. x < -9
B. x < -8
C. x > -8
D. x < 4
E. x > 4


\(|2x+3|≤12\)

i.e. \(-12 ≤ 2x+3 ≤ 12\)

i.e. \(-12-3 ≤ 2x ≤ 12-3\)

i.e. \(-15 ≤ 2x ≤ 9\)

i.e. \(-7.5 ≤ x ≤ 4.5\)

Out of all options we see

A. x < -9 Is INCORRECT as all values of x are greater than -9
B. x < -8 Is INCORRECT as all values of x are greater than -8
C. x > -8 Is CORRECT because all values of x in the calculated range of values of x are greater than -8
D. x < 4 Is INCORRECT because x may be 4 which is NOT less than 4
E. x > 4 Is INCORRECT as x may be less than 4 as well

Answer: Option C
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Originally posted by GMATinsight on 18 Oct 2018, 23:24.
Last edited by GMATinsight on 20 Oct 2018, 20:52, edited 1 time in total.
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 18 Oct 2018, 23:42
Bunuel wrote:
If x is an integer and \(|2x+3|≤12\), then which of the following must be true?

A. x < -9
B. x < -8
C. x > -8
D. x < 4
E. x > 4


use this link to solve - https://gmatclub.com/forum/inequalities ... 06653.html
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 19 Oct 2018, 00:42
Bunuel wrote:
If x is an integer and \(|2x+3|≤12\), then which of the following must be true?

A. x < -9
B. x < -8
C. x > -8
D. x < 4
E. x > 4


\(|2x+3|≤12\)

\(|x+3/2|≤6\)

So x is a point that is a distance of 6 or less from -1.5
So x would be less than 4.5 or more than -7.5

\(-7.5 \leq x \leq 4.5\)

<------------------------ (-7.5) ================== (4.5) ---------------------->

x can take any value in the "===" region. For each value in this region, x is definitely greater than -8.

Answer (C)

For more, check: https://www.veritasprep.com/blog/2011/0 ... edore-did/
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If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post Updated on: 21 Oct 2018, 08:08
Hi [url=https://gmatclub.com:443/forum/memberlist.php?mode=viewprofile&un=VeritasKarishma]VeritasKarishmaAnother way!
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Originally posted by HAPPYatHARVARD on 20 Oct 2018, 05:53.
Last edited by HAPPYatHARVARD on 21 Oct 2018, 08:08, edited 2 times in total.
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 20 Oct 2018, 08:22
Quote:
A. x < -9 Is INCORRECT as all values of x are greater than -9
B. x < -8 Is INCORRECT as all values of x are greater than -8
C. x > -8 Is CORRECT because all values of x in the calculated range of values of x are greater than -8
D. x < 4 Is INCORRECT because x may be 4.25 which is greater than 4
E. x > 4 Is INCORRECT as x may be less than 4 as well

Answer: Option C


Quick clarification question - with regard to answer D, x is an integer—so 4.25 being greater than 4 is not the reason why the choice is wrong. It's because x could be 4, which is not included by x < 4. Is that correct?
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 20 Oct 2018, 20:52
fogarasm wrote:
Quote:
A. x < -9 Is INCORRECT as all values of x are greater than -9
B. x < -8 Is INCORRECT as all values of x are greater than -8
C. x > -8 Is CORRECT because all values of x in the calculated range of values of x are greater than -8
D. x < 4 Is INCORRECT because x may be 4.25 which is greater than 4
E. x > 4 Is INCORRECT as x may be less than 4 as well

Answer: Option C


Quick clarification question - with regard to answer D, x is an integer—so 4.25 being greater than 4 is not the reason why the choice is wrong. It's because x could be 4, which is not included by x < 4. Is that correct?


fogarasm Thank you for pointing out the mistake in the mistake. I missed the information in quick solving the question. :)
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 20 Oct 2018, 21:04
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 23 Oct 2018, 02:49
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HAPPYatHARVARD wrote:
Hi [url=https://gmatclub.com:443/forum/memberlist.php?mode=viewprofile&un=VeritasKarishma]VeritasKarishmaAnother way!


Yes, this method uses the definition of absolute values. The method I have shown is based on the concept of looking at absolute value in terms of distance.
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 11 Nov 2018, 17:26
GMATinsight wrote:
Bunuel wrote:
If x is an integer and \(|2x+3|≤12\), then which of the following must be true?

A. x < -9
B. x < -8
C. x > -8
D. x < 4
E. x > 4


\(|2x+3|≤12\)

i.e. \(-12 ≤ 2x+3 ≤ 12\)

i.e. \(-12-3 ≤ 2x ≤ 12-3\)

i.e. \(-15 ≤ 2x ≤ 9\)

i.e. \(-7.5 ≤ x ≤ 4.5\)

Out of all options we see

A. x < -9 Is INCORRECT as all values of x are greater than -9
B. x < -8 Is INCORRECT as all values of x are greater than -8
C. x > -8 Is CORRECT because all values of x in the calculated range of values of x are greater than -8
D. x < 4 Is INCORRECT because x may be 4 which is NOT less than 4
E. x > 4 Is INCORRECT as x may be less than 4 as well

Answer: Option C


I got the same range but won't x > -8 include values above 4.5 ?
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must  [#permalink]

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New post 12 Nov 2018, 03:37
1
shobhiitgupta wrote:
GMATinsight wrote:
Bunuel wrote:
If x is an integer and \(|2x+3|≤12\), then which of the following must be true?

A. x < -9
B. x < -8
C. x > -8
D. x < 4
E. x > 4


\(|2x+3|≤12\)

i.e. \(-12 ≤ 2x+3 ≤ 12\)

i.e. \(-12-3 ≤ 2x ≤ 12-3\)

i.e. \(-15 ≤ 2x ≤ 9\)

i.e. \(-7.5 ≤ x ≤ 4.5\)

Out of all options we see

A. x < -9 Is INCORRECT as all values of x are greater than -9
B. x < -8 Is INCORRECT as all values of x are greater than -8
C. x > -8 Is CORRECT because all values of x in the calculated range of values of x are greater than -8
D. x < 4 Is INCORRECT because x may be 4 which is NOT less than 4
E. x > 4 Is INCORRECT as x may be less than 4 as well

Answer: Option C


I got the same range but won't x > -8 include values above 4.5 ?



The logic is,

When it's known that \(-7.5 ≤ x ≤ 4.5\) then for all possible values of x we can say that each value will certainly be greater than -8

on the other hand you can prove all other options incorrect as per the following explanation (already mentioned in previous solutions)

A. x < -9 Is INCORRECT as all values of x are greater than -9
B. x < -8 Is INCORRECT as all values of x are greater than -8
C. x > -8 Is CORRECT because all values of x in the calculated range of values of x are greater than -8
D. x < 4 Is INCORRECT because x may be 4 which is NOT less than 4
E. x > 4 Is INCORRECT as x may be less than 4 as well

I hope this helps!!!
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e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
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Re: If x is an integer and |2x + 3| ≤ 12 then which of the following must &nbs [#permalink] 12 Nov 2018, 03:37
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