Question 87958
{{{(sqrt(3)-sqrt(5))(sqrt(3)-sqrt(5))}}}
{{{(3- sqrt(3)sqrt(5)-sqrt(5)sqrt(3)+5)}}} [use FOIL to multiply; remember that squaring a square root will result in the radicand]
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{{{(8- 2sqrt(3)sqrt(5)))}}}  [combine like-terms if possible]

{{{(8- 2sqrt(3*5)))}}}
{{{(8- 2sqrt(15)))}}}