3akar 18-4akar50+2akar72-5akar2

[tex]3 \sqrt{18} - 4 \sqrt{50} + 2 \sqrt{72} - 5 \sqrt{2} \\ = 3 \sqrt{9 \times 2} - 4 \sqrt{25 \times 2} + 2 \sqrt{36 \times 2} - 5 \sqrt{2} \\ = 3 \times 3 \sqrt{2} - 4 \times 5 \sqrt{2} + 2 \times 6 \sqrt{2} - 5 \sqrt{2} \\ = 9 \sqrt{2} - 20 \sqrt{2} + 12 \sqrt{2} - 5 \sqrt{2} \\ = - 4 \sqrt{2} [/tex]
semoga formulanya tidak bermasalah