5 akar 80 + 2 akar 3 - akar 45 adalah...?

[tex] = 5 \sqrt{80} + 2 \sqrt{3} - \sqrt{45} \\ = 5 \sqrt{16 \times 5} + 2 \sqrt{3} - \sqrt{9 \times 5} \\ = 20 \sqrt{5} + 2 \sqrt{3} - 3 \sqrt{5} \\ = (20 - 3) \sqrt{5} + 2 \sqrt{3} \\ = 17 \sqrt{5} + 2 \sqrt{3} [/tex]