a) $\sqrt{32} - 3\sqrt{8} + \sqrt{98} = $

b) $2\sqrt{12} + 3\sqrt{120} - 4\sqrt{1080} + 5\sqrt{75} = $

c) $\sqrt[3]{-8} + \sqrt[3]{-1} = $

d) $(2 + \sqrt{10})(3 - 2\sqrt{10}) = $