Difference between revisions of "2006 Cyprus MO/Lyceum/Problem 2"

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==Problem==
 
==Problem==
The operation <math>\alpha*\beta</math> is defined by <math>\alpha*\beta=\alpha^2-\beta^2\forall\alpha,\beta\in\mathbb{R}</math>.
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The operation <math>\alpha*\beta</math> is defined by <math>\alpha*\beta=\alpha^2-\beta^2\ \forall\alpha,\beta\in\mathbb{R}</math>.
 
The value of the expression <math>K=\left[\left(1+\sqrt{3}\right)*2\right]*\sqrt{2}</math> is
 
The value of the expression <math>K=\left[\left(1+\sqrt{3}\right)*2\right]*\sqrt{2}</math> is
  

Latest revision as of 09:56, 27 April 2008

Problem

The operation $\alpha*\beta$ is defined by $\alpha*\beta=\alpha^2-\beta^2\ \forall\alpha,\beta\in\mathbb{R}$. The value of the expression $K=\left[\left(1+\sqrt{3}\right)*2\right]*\sqrt{2}$ is

$\mathrm{(A)}\ 3\qquad\mathrm{(B)}\ 0\qquad\mathrm{(C)}\ \sqrt{3}\qquad\mathrm{(D)}\ 9\qquad\mathrm{(E)}\ 1$

Solution

$(1+\sqrt{3})*2=(1+\sqrt{3})^2-2^2=1^2+2\sqrt{3}+3-4=2\sqrt{3}$

$2\sqrt{3}*\sqrt{2} = 12-2=10$

See also

2006 Cyprus MO, Lyceum (Problems)
Preceded by
Problem 1
Followed by
Problem 3
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