



 
HI Agnes, You have written the expression \[\left( 1 + \sqrt{3}\right) \left( \frac13 + \sqrt{3}\right)\] but I think what the expression should be is \[\left( 1 + \sqrt{3}\right) \left( \frac{1}{3 + \sqrt{3}}\right)= \frac{1 + \sqrt{3}}{3 + \sqrt{3}}.\] If I am correct then you need to "rationalize the denominator" by multiplying the numerator and denominator by \[3  \sqrt{3}.\] I hope this helps,  


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