Hello people,
Needed your opinion on this
Its a simple question.
If a>0,b>0 and 2c=sqrt(a/b) ,what is the value of b
1.a=8 and c=2
2.(c^2/a)=1/2 (Its c square by a equals half)
The answer is D
Now my question is what if they had not given a>0 and b>0
Does it impact the question?
Or does the answer remain the same in that case too??
Please share your opinion on this.
Thanks
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
Please check this DS question out!!
This topic has expert replies
-
dddanny2006
- Master | Next Rank: 500 Posts
- Posts: 209
- Joined: Thu Jan 12, 2012 12:59 pm
-
Jim@StratusPrep
- MBA Admissions Consultant
- Posts: 2279
- Joined: Fri Nov 11, 2011 7:51 am
- Location: New York
- Thanked: 660 times
- Followed by:266 members
- GMAT Score:770
Wouldn't matter in the context of the GMAT because you can't take the sqrt of a negative number. That is all they are getting across.
GMAT Answers provides a world class adaptive learning platform.
-- Push button course navigation to simplify planning
-- Daily assignments to fit your exam timeline
-- Organized review that is tailored based on your abiility
-- 1,000s of unique GMAT questions
-- 100s of handwritten 'digital flip books' for OG questions
-- 100% Free Trial and less than $20 per month after.
-- Free GMAT Quantitative Review
-- Push button course navigation to simplify planning
-- Daily assignments to fit your exam timeline
-- Organized review that is tailored based on your abiility
-- 1,000s of unique GMAT questions
-- 100s of handwritten 'digital flip books' for OG questions
-- 100% Free Trial and less than $20 per month after.
-- Free GMAT Quantitative Review
GMAT/MBA Expert
-
[email protected]
- Elite Legendary Member
- Posts: 10392
- Joined: Sun Jun 23, 2013 6:38 pm
- Location: Palo Alto, CA
- Thanked: 2867 times
- Followed by:511 members
- GMAT Score:800
Hi dddanny2006,
I'm going to elaborate on what Jim offered regarding certain math subjects on the GMAT. The Quant section of the GMAT comes with many restrictions, which is why the questions are so specifically worded.
For example, a question that refers to x/y will also have to state that y CANNOT EQUAL 0, because dividing by 0 (otherwise known as "undefined numbers" or "infinities") is not a subject that's tested on the GMAT.
To be more specific, you will never be asked to do Calculus, Trigonometry, or Algebra II. In this question, you won't be asked to take the square root of a negative number because THAT is an Algebra II subject (so the limitations on a and b had to be included in the instructions).
GMAT assassins aren't born, they're made,
Rich
I'm going to elaborate on what Jim offered regarding certain math subjects on the GMAT. The Quant section of the GMAT comes with many restrictions, which is why the questions are so specifically worded.
For example, a question that refers to x/y will also have to state that y CANNOT EQUAL 0, because dividing by 0 (otherwise known as "undefined numbers" or "infinities") is not a subject that's tested on the GMAT.
To be more specific, you will never be asked to do Calculus, Trigonometry, or Algebra II. In this question, you won't be asked to take the square root of a negative number because THAT is an Algebra II subject (so the limitations on a and b had to be included in the instructions).
GMAT assassins aren't born, they're made,
Rich
-
faraz_jeddah
- Master | Next Rank: 500 Posts
- Posts: 358
- Joined: Thu Apr 18, 2013 9:46 am
- Location: Jeddah, Saudi Arabia
- Thanked: 42 times
- Followed by:7 members
- GMAT Score:730
Thanks Rich for a detailed explanation.[email protected] wrote:Hi dddanny2006,
I'm going to elaborate on what Jim offered regarding certain math subjects on the GMAT. The Quant section of the GMAT comes with many restrictions, which is why the questions are so specifically worded.
For example, a question that refers to x/y will also have to state that y CANNOT EQUAL 0, because dividing by 0 (otherwise known as "undefined numbers" or "infinities") is not a subject that's tested on the GMAT.
To be more specific, you will never be asked to do Calculus, Trigonometry, or Algebra II. In this question, you won't be asked to take the square root of a negative number because THAT is an Algebra II subject (so the limitations on a and b had to be included in the instructions).
GMAT assassins aren't born, they're made,
Rich
There is another rule regarding square roots. Can you confirm the rule below
x^2 = 4
x can be 2 or -2
but if
x = sq.rt 4
then x can only be 2.
A good question also deserves a Thanks.
Messenger Boy: The Thesselonian you're fighting... he's the biggest man i've ever seen. I wouldn't want to fight him.
Achilles: That's why no-one will remember your name.
Messenger Boy: The Thesselonian you're fighting... he's the biggest man i've ever seen. I wouldn't want to fight him.
Achilles: That's why no-one will remember your name.
GMAT/MBA Expert
-
[email protected]
- Elite Legendary Member
- Posts: 10392
- Joined: Sun Jun 23, 2013 6:38 pm
- Location: Palo Alto, CA
- Thanked: 2867 times
- Followed by:511 members
- GMAT Score:800
Hi faraz_jeddah,
You are correct. On the GMAT, if you start with....
x^2 = 25, then there are TWO answers: +5 and -5
But if you start with...
squareroot(25), then there is JUST ONE answer: +5
GMAT assassins aren't born, they're made,
Rich
You are correct. On the GMAT, if you start with....
x^2 = 25, then there are TWO answers: +5 and -5
But if you start with...
squareroot(25), then there is JUST ONE answer: +5
GMAT assassins aren't born, they're made,
Rich
