Question 161349
(√[3] + 4√[5])(2√[3] – √[5])
;
{{{(sqrt(3) + 4sqrt(5)) * (2sqrt(3) - sqrt(5))}}}
:
FOIL
{{{2sqrt(9)- sqrt(15) + 8sqrt(15) - 4sqrt(25)}}}
;
Which is:
{{{2(3)- sqrt(15) + 8sqrt(15) - 4(5)}}}
:
{{{6 + 7sqrt(15) - 20}}}
:
{{{7sqrt(15) - 14}}}