tolong di jawab kan beserta cara nya

[tex]5 \sqrt{32} + \sqrt{50} + 3 \sqrt{98} \\ = 5 \sqrt{16 \times 2} + \sqrt{25 \times 2} + 3 \sqrt{49 \times 2} \\ = 5 \times 4 \sqrt{2} + 5 \sqrt{2} + 3 \times 7 \sqrt{2} \\ = 20 \sqrt{2} + 5 \sqrt{2} + 21 \sqrt{2} \\ = 45 \sqrt{2} [/tex]
[tex] \sqrt{50} + 2 \sqrt{98} - 5 \sqrt{32} \\ = \sqrt{25 \times 2} + 2 \sqrt{49 \times 2} - 5 \sqrt{16 \times 2} \\ = 5 \sqrt{2} + 2 \times 7 \sqrt{2} - 5 \times 4 \sqrt{2} \\ = 5 \sqrt{2} + 14 \sqrt{2} - 20 \sqrt{2} \\ - \sqrt{2} [/tex]
[tex]( \sqrt{3} - 3 \sqrt{5} )( \sqrt{3} + \sqrt{5} ) \\ = 3 - 3 \sqrt{5 \times 3} + \sqrt{3 \times 5} - 3 \times 5 \\ = 3 - 2 \sqrt{5 \times 3} - 15 \\ = - 12 - 2 \sqrt{15} [/tex]