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Squared problem

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by ssmiles08 » Sun May 17, 2009 8:17 pm
I would have not gotten that one either.

https://www.beatthegmat.com/square-root- ... 16615.html

I think that would explain it a lot better than I would have
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Re: Squared problem

by sanju09 » Mon May 18, 2009 5:15 am
Kasper Madsen wrote:Can someone please help me by explaining how you reach the answer in this question?
Recall: (a + b)^2 = a^2 + b^2 + 2 a b and (a + b) (a - b) = a^2 - b^2, and proceed like this:

[{√9 + (√80)} + {√9 – (√80)}]^2

= 9 + √80 + 9 – √80 + 2 × (81 – 80)

= 18 + 2

= 20.
The mind is everything. What you think you become. -Lord Buddha



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