Question 441774
1.) {{{sqrt(2) + sqrt(2/49) = sqrt(2) + sqrt(2)/7 = (8sqrt(2))/7}}}

2.)  {{{(sqrt(2))^2 - 3^2 = 2 - 9 = -7}}}

3.)  {{{(sqrt(3))^2 - 2*sqrt(3)*sqrt(5) + (sqrt(5))^2 = 3- 2*sqrt(3)*sqrt(5) + 5 = 8- 2*sqrt(15) }}}