Bagai mana cara nya dan berapa hasil nya?

penye =

=[tex]3 \sqrt{8} - 4 \sqrt{18} + \sqrt{32} [/tex]
=[tex]3 \sqrt{2 \times 4} - 4 \sqrt{9 \times 2} + \sqrt{2 \times 16} [/tex]
=[tex]3 \times 2 \sqrt{2} - 4 \times 3 \sqrt{2} + 4 \sqrt{2} [/tex]
=[tex]6 \sqrt{2} - 12 \sqrt{2} + 4 \sqrt{2} [/tex]
=[tex](6 - 12 + 4) \sqrt{2} [/tex]
=[tex] - 2 \sqrt{2} [/tex]