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# Is b^2 <= a^2?

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Manager
Joined: 20 Jul 2018
Posts: 75
WE: Corporate Finance (Investment Banking)
Is b^2 <= a^2?  [#permalink]

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Updated on: 07 Oct 2018, 20:57
2
8
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Difficulty:

65% (hard)

Question Stats:

55% (01:35) correct 45% (01:23) wrong based on 141 sessions

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Is $$b^2≤a^2$$

(1) b ≤ a

(2) a+b = a−b

Originally posted by Kaczet on 06 Oct 2018, 09:03.
Last edited by amanvermagmat on 07 Oct 2018, 20:57, edited 2 times in total.
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Posts: 7334
Re: Is b^2 <= a^2?  [#permalink]

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06 Oct 2018, 18:45
Kaczet wrote:
Is $$a^2≤b^2$$

(1) b ≤ a

(2) a+b = a−b

$$a^2\leq{b^2}......|a|\leq{|b|}$$

(1) b ≤ a
If a>0 and b<0,
say a=10 and b =3 a^2>b^2
but if a=3 and b=-10 a^2<b^2
Insufficient

(2) a+b = a−b
So 2b=0 or b=0
So b^2=0 and whatever be the value of a, a^2 will never be less than 0
Sufficient

B
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
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3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
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Re: Is b^2 <= a^2?  [#permalink]

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06 Oct 2018, 22:25
chetan2u

Hi

Having issue with statement 2.
If b =o
The stem becomes is a less than or equal to zero ?

Case 1 A is anything but zero.
Answer to stem No

Case 2 A is zero.
Answer to stem Yes a^2 is less than or equal to zero

Posted from my mobile device
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Re: Is b^2 <= a^2?  [#permalink]

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06 Oct 2018, 22:28
ShankSouljaBoi wrote:
chetan2u

Hi

Having issue with statement 2.
If b =o
The stem becomes is a less than or equal to zero ?

Case 1 A is anything but zero.
Answer to stem No

Case 2 A is zero.
Answer to stem Yes a^2 is less than or equal to zero

Posted from my mobile device

No it doesn't say anything about a..

a+b=a-b
Say b is 0, then a+0=a-0....a=a
Always true' irrespective of the value of a
So a can be anything
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html
4) Base while finding % increase and % decrease : https://gmatclub.com/forum/percentage-increase-decrease-what-should-be-the-denominator-287528.html

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Manager
Joined: 21 Jun 2017
Posts: 234
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WE: Corporate Finance (Commercial Banking)
Re: Is b^2 <= a^2?  [#permalink]

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06 Oct 2018, 23:11
chetan2u wrote:
ShankSouljaBoi wrote:
chetan2u

Hi

Having issue with statement 2.
If b =o
The stem becomes is a less than or equal to zero ?

Case 1 A is anything but zero.
Answer to stem No

Case 2 A is zero.
Answer to stem Yes a^2 is less than or equal to zero

Posted from my mobile device

No it doesn't say anything about a..

a+b=a-b
Say b is 0, then a+0=a-0....a=a
Always true' irrespective of the value of a
So a can be anything

Still , not clear.

Rephrasing stem with statement 2.

Is a^2 <=0 ?

Case 1 a=0 . Yes inequality hold true.

Case 2 a is not equal to zero. No inequality is false.

Please guide.
_________________

Even if it takes me 30 attempts, I am determined enough to score 740+ in my 31st attempt. This is it, this is what I have been waiting for, now is the time to get up and fight, for my life is 100% my responsibility.

Dil ye Ziddi hai !!!

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Joined: 20 Jul 2018
Posts: 75
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Re: Is b^2 <= a^2?  [#permalink]

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07 Oct 2018, 05:56
ShankSouljaBoi of course, you are right. That's why I asked the said question on forums. It appeared that way to me during my CAT.
I started scrutinizing the question anew, and corrected it after I had found the typo. Thanks for vigilance.
Manager
Joined: 21 Jun 2017
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Re: Is b^2 <= a^2?  [#permalink]

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07 Oct 2018, 06:02
Kaczet wrote:
ShankSouljaBoi of course, you are right. That's why I asked the said question on forums. It appeared that way to me during my CAT.
I started scrutinizing the question anew, and corrected it after I had found the typo. Thanks for vigilance.

heheh no worries. Im glad i could help
_________________

Even if it takes me 30 attempts, I am determined enough to score 740+ in my 31st attempt. This is it, this is what I have been waiting for, now is the time to get up and fight, for my life is 100% my responsibility.

Dil ye Ziddi hai !!!

Manager
Joined: 10 Sep 2015
Posts: 72
Location: India
Concentration: Finance, Human Resources
GMAT 1: 640 Q47 V31
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Re: Is b^2 <= a^2?  [#permalink]

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14 Oct 2018, 11:13
answer shall be E, not sure how B is marked as OA
Manager
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Re: Is b^2 <= a^2?  [#permalink]

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14 Oct 2018, 11:14
Hi Bunuel,

please check and update the OA if found wrong.
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Is b^2 <= a^2?  [#permalink]

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14 Oct 2018, 12:18
asthagupta wrote:
answer shall be E, not sure how B is marked as OA

B is the correct answer.

From the statement (2) you have that b=0; no matter what, a^2 can't be less than 0.
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Re: Is b^2 <= a^2?  [#permalink]

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16 Oct 2018, 22:43
Kaczet wrote:
asthagupta wrote:
answer shall be E, not sure how B is marked as OA

B is the correct answer.

From the statement (2) you have that b=0; no matter what, a^2 can't be less than 0.

question is saying less than or EQUAL to,
even if B is 0, A can be zero and hence A=B
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Re: Is b^2 <= a^2?  [#permalink]

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17 Oct 2018, 00:06
1
1
asthagupta wrote:
Kaczet wrote:
asthagupta wrote:
answer shall be E, not sure how B is marked as OA

B is the correct answer.

From the statement (2) you have that b=0; no matter what, a^2 can't be less than 0.

question is saying less than or EQUAL to,
even if B is 0, A can be zero and hence A=B

The statement holds true even if A=B, doesn't it?
From (B) we have that B=0. If A=B=0 then a^2 = b^2. If a≠0 and b=0, then a^2>b^2 no matter what.
You did underscore "equal" yourself, I don't see the problem.
Re: Is b^2 <= a^2?   [#permalink] 17 Oct 2018, 00:06
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