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
Please check this DS question out!!
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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.
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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,
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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
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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.
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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