[tex]2 \sqrt{8} - 5 \sqrt{32} + 4 \sqrt{50} - 6 \sqrt{18} = [/tex]
[tex]2 \sqrt{ {2}^{2} \times 2} - 5 \sqrt{ {4}^{2} \times 2 } + 4 \sqrt{ {5}^{2} \times 2} - 6 \sqrt{ {3}^{2} \times 2 } = [/tex]
[tex]2 \times 2 \sqrt{ 2} - 5 \times 4 \sqrt{ 2 } + 4 \times 5\sqrt{ 2} - 6 \times 3\sqrt{ 2 } = [/tex]
[tex]4\sqrt{ 2} - 20 \sqrt{ 2 } + 20\sqrt{ 2} - 18\sqrt{ 2 } = [/tex]
[tex]4\sqrt{ 2} - 18\sqrt{ 2 } = [/tex]
[tex] = - 14 \sqrt{2} [/tex]
