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Re: If a^(1/2)=b, what is the value of integer b? [#permalink]
chetan2u wrote:
If \(\sqrt{a}=b\), what is the value of integer b?
(1) b=|2|
(2) a+b>0



given
\(\sqrt{a}=b\)
a=b^2
#1
b=|2|
lbl=√b^2
with b= 2 the value of √b^2 = 2 ; sufficient
#2
a+b>0
√b+b>0
√b(1+√b)=0
√b=0 or √b=-1
insufficeint
IMO A
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If a^(1/2)=b, what is the value of integer b? [#permalink]
globaldesi wrote:
1) Stmt 1: given |b| = 2
and \(a^(1/2)=b\)
\(a^(1/2)\) can not be negative hence b has to be postive thus B = 2
sufficient
2) a+b>0
this gives no information about the sum total
only information is a and b , both are positive
Infsufficient
Hence Answer A


square root of a natural number can be a negative as well as positive number. the equivalent value is square root always comes in pairs. sq. rt of 4 is 2,-2. because 2*2 = -2*-2 = 4.

Then how can A be sufficient.

chetan2u Bunuel VeritasKarishma
is this again a GMAT World only situation?
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Re: If a^(1/2)=b, what is the value of integer b? [#permalink]
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MaryKaaviya wrote:
globaldesi wrote:
1) Stmt 1: given |b| = 2
and \(a^(1/2)=b\)
\(a^(1/2)\) can not be negative hence b has to be postive thus B = 2
sufficient
2) a+b>0
this gives no information about the sum total
only information is a and b , both are positive
Infsufficient
Hence Answer A


square root of a natural number can be a negative as well as positive number. the equivalent value is square root always comes in pairs. sq. rt of 4 is 2,-2. because 2*2 = -2*-2 = 4.

Then how can A be sufficient.

chetan2u Bunuel VeritasKarishma
is this again a GMAT World only situation?



Check this link for more such concepts:
https://www.gmatclub.com/forum/veritas-prep-resource-links-no-longer-available-399979.html#/2016/0 ... oots-gmat/
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Re: If a^(1/2)=b, what is the value of integer b? [#permalink]
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Re: If a^(1/2)=b, what is the value of integer b? [#permalink]
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