a.
[tex] \sqrt{8} + \sqrt{32} - \sqrt{50} = 2 \sqrt{2} + 4 \sqrt{2} - 5 \sqrt{2} = \sqrt{2}[/tex]
b.
[tex] \sqrt{75} + \sqrt{12} - \sqrt{243} = 5 \sqrt{3} + 2 \sqrt{3} - 9 \sqrt{3} = - 2 \sqrt{3} [/tex]
c.
[tex]2 - \sqrt{28} - 3 + \sqrt{63} = 2 - 2 \sqrt{7} - 3 + 3 \sqrt{7} = - 1 + \sqrt{7} [/tex]
d.
[tex] \sqrt{54} - \sqrt{24} - \sqrt{180} + 7 \sqrt{5} = 3 \sqrt{6} - 2 \sqrt{6} - 6 \sqrt{5} + 7 \sqrt{5} = \sqrt{6} + \sqrt{5} [/tex]