simplifying [2^{1/2} + 2^{3/2}]^2

Quadratic equations and inequalities, variation equations, function notation, systems of equations, etc.
EdSewersPark
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simplifying [2^{1/2} + 2^{3/2}]^2

Postby EdSewersPark » Mon May 23, 2011 9:13 pm



This one looks so easy, but still I am getting it wrong. Solution is 18 and I keep getting 10.

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stapel_eliz
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Postby stapel_eliz » Mon May 23, 2011 10:44 pm

EdSewersPark wrote:Solution is 18 and I keep getting 10.

It's a lot easier to check work that we can see... :wink:

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Re: simplifying [2^{1/2} + 2^{3/2}]^2

Postby EdSewersPark » Tue May 24, 2011 12:36 am



or or




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stapel_eliz
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Postby stapel_eliz » Tue May 24, 2011 10:48 am

EdSewersPark wrote:

...

Hint: (a + b)2 does not equal a2 + b2! :wink:

Instead, try using properties of radicals:

. . . . .

...and so forth. :wink:

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Re: simplifying [2^{1/2} + 2^{3/2}]^2

Postby EdSewersPark » Tue May 24, 2011 12:13 pm











tada. Thank you for your help!


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