c)
[tex] \sqrt{27} + \sqrt{243} + \sqrt{75} - \sqrt{108} [/tex]
[tex]3 \sqrt{3} + 9 \sqrt{3} +5 \sqrt{3} - 6 \sqrt{3} [/tex]
[tex] = 11 \sqrt{3} [/tex]
d)
[tex] \sqrt{72} - \sqrt{96} + \sqrt{128} [/tex]
[tex]6 \sqrt{2 } - 7 \sqrt{2} + 8 \sqrt{2} [/tex]
[tex] = 7 \sqrt{2} [/tex]
