[tex]a) \sqrt{2} + \sqrt{2} = (1 + 1) \sqrt{2} = 2 \sqrt{2} [/tex]
[tex]b)2 \sqrt{5} + 3 \sqrt{5} = (2 + 3) \sqrt{5} = 5 \sqrt{5} [/tex]
[tex]c) \sqrt{3} + ( - \sqrt{3} ) = 0[/tex]
[tex]d) \sqrt{5} - \sqrt{5} = 0[/tex]
[tex]e)7 \sqrt{7} - 2 \sqrt{7} = (7 - 2) \sqrt{7} = 5 \sqrt{7} [/tex]
[tex]f) \sqrt{6} - 3 \sqrt{6} = 1 \sqrt{6} - 3 \sqrt{6} = (1 - 3) \sqrt{6} = - 2 \sqrt{6} [/tex]
[tex]g) \sqrt{6} + 2 \sqrt{6} + 3 \sqrt{6} = 1 \sqrt{6} + 2 \sqrt{6} + 3 \sqrt{6} = (1 + 2 + 3) \sqrt{6} = 6 \sqrt{6} [/tex]
