Question 1029824
Start here,
{{{(a+b)^2=a^2+2ab+b^2}}}
Substitute,
{{{(sqrt(3)+sqrt(5))^2=(sqrt(3))^2+2sqrt(3)sqrt(5)+(sqrt(5))^2}}}
{{{(sqrt(3)+sqrt(5))^2=3+2sqrt(15)+5}}}
{{{(sqrt(3)+sqrt(5))^2=8+2sqrt(15)}}}
{{{(sqrt(3)+sqrt(5))^2=2(4+sqrt(15))}}}