While posting the question pls check if you have posted the question correctly or not.
Kindly correct the statement II
This is OG 11 ques 142
9^x + 9^-x = b ?????
Statement I
3^x + 3^-x = sqrt(b+2)
3^x + 1/3^x = sqrt(b+2)
square both sides and expand
9^x + 1/9^x + 2 = b+2
9^x+1/9^x = b
Therefore sufficient.
Statement II
x>0
We dont know what b is, x could be anything 1,2,3,4,....n
Therefore Insufficient.
Hence A is the answer.
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Source: Beat The GMAT — Data Sufficiency |
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parallel_chase
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bha
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Parallel_chase..thankks for ur prompt response.
In my book, stmt 2 says x>0=b..I verified it again....
but their answer explanation says - stmt 2 does't give any relationship between x and b....I guess it is typo error in question.
But if stmt is x=b..I think this stmt is sufficient as for any value of x>0, 9^x+9^-x will never be equal to x(=b)..hence stmt is sufficient...what do u think?
In my book, stmt 2 says x>0=b..I verified it again....
but their answer explanation says - stmt 2 does't give any relationship between x and b....I guess it is typo error in question.
But if stmt is x=b..I think this stmt is sufficient as for any value of x>0, 9^x+9^-x will never be equal to x(=b)..hence stmt is sufficient...what do u think?
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parallel_chase
- Legendary Member
- Posts: 1153
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Yup there is a typo in your bookbha wrote:Parallel_chase..thankks for ur prompt response.
In my book, stmt 2 says x>0=b..I verified it again....
but their answer explanation says - stmt 2 does't give any relationship between x and b....I guess it is typo error in question.
But if stmt is x=b..I think this stmt is sufficient as for any value of x>0, 9^x+9^-x will never be equal to x(=b)..hence stmt is sufficient...what do u think?
Statement II x>0
Thats why the explanation says no relationship between x and b
