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Nee help on fundamentals of Algebra

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Nee help on fundamentals of Algebra [#permalink] New post 26 Dec 2012, 12:56
I m stuck with few concepts
1. a^2 = b^2
>>>>Is a or b + or - ve

2. a = b^2

Either a = +b or a = -b
Am i right or wrong

3. a^2 = b ^4

>>>.Which one is +or - ve

I have gone through various sources but i am getting confused over and again

Bunuel can u pls help...................
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Re: Nee help on fundamentals of Algebra [#permalink] New post 26 Dec 2012, 23:46
Am not Bunuel but I can try :)
Archit143 wrote:
I m stuck with few concepts
1. a^2 = b^2
>>>>Is a or b + or - ve

This means that a = +b or -b
Do both a and b can be positive or negative or 0

Archit143 wrote:
2. a = b^2

Either a = +b or a = -b
Am i right or wrong

In this b can be + or - but a will be + or 0 for sure as b^2 cannot be negative in any case

Archit143 wrote:
3. a^2 = b ^4

>>>.Which one is +or - ve

I have gone through various sources but i am getting confused over and again

Bunuel can u pls help...................

Here both a and b can be positive negative or 0 as
a= +b^2 or -b^2

Hope it helps!
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Re: Nee help on fundamentals of Algebra [#permalink] New post 26 Dec 2012, 23:52
Archit143 wrote:
I m stuck with few concepts
1. a^2 = b^2
>>>>Is a or b + or - ve

2. a = b^2

Either a = +b or a = -b
Am i right or wrong

3. a^2 = b ^4

>>>.Which one is +or - ve

I have gone through various sources but i am getting confused over and again

Bunuel can u pls help...................


1. When a^2 = b^2 and you want to take square root then the answer is

|a|=|b| Now when you open the MOD the answer becomes a = +- b

2. You are wrong. Apply the above rule and you would \sqrt{a}= b
b = positive because square root of value is always positive.

3. a^2 = b ^4.. Again apply the rule of 1. You will get |a|=|b^2|
Since b^2 is always positive => a is always positive. Thus a = b^2
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Director
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Status: Final Lap Up!!!
Affiliations: NYK Line
Joined: 21 Sep 2012
Posts: 943
Location: India
Schools: Cox '16
GMAT Date: 05-29-2013
GPA: 3.2
WE: Engineering (Transportation)
Followers: 13

Kudos [?]: 91 [0], given: 57

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Re: Nee help on fundamentals of Algebra [#permalink] New post 27 Dec 2012, 09:50
Thnx all for clearing my doubt...
Re: Nee help on fundamentals of Algebra   [#permalink] 27 Dec 2012, 09:50
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