I have always thought that when GMAT gives you a Square Root....it only has one possible answer, and hat is its positive solution (the negative solution is not taken on account).
So I am having problems understanding thid problem:
What is the value of x?
1) Squareroot(x^4)=9
2) The average of x, 6x, and 3 is -2
Statement 2 is SUFF.
But what about statement 1? One would think that "Squareroot(x^4)=9" is the same has saying "x^2=9" so x has two possible answers: +3 and -3. BUT I thought that when GMAT writes "Squareroot" it is only refering to the positive value of the root...that is +3.....So I chose D, but the correct answer is B because it says that satement 1 gives two possible answer (+3 and -3).
Can someone please explain me if its true or not that when GMAT gives us a Squareroot it only has one possible answer (the positive value)??
Thanks!
I am bit confused...
So I am having problems understanding thid problem:
What is the value of x?
1) Squareroot(x^4)=9
2) The average of x, 6x, and 3 is -2
Statement 2 is SUFF.
But what about statement 1? One would think that "Squareroot(x^4)=9" is the same has saying "x^2=9" so x has two possible answers: +3 and -3. BUT I thought that when GMAT writes "Squareroot" it is only refering to the positive value of the root...that is +3.....So I chose D, but the correct answer is B because it says that satement 1 gives two possible answer (+3 and -3).
Can someone please explain me if its true or not that when GMAT gives us a Squareroot it only has one possible answer (the positive value)??
Thanks!
I am bit confused...
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