Question

o valor de √20+√45+√245

Answer 1

$\sqrt{20} + \sqrt{45} + \sqrt{245} = \\ = \sqrt{ {2}^{2} \times 5} + \sqrt{ {3}^{2} \times 5 } + \sqrt{ {7}^{2} \times 5} = \\ = 2 \sqrt{5} + 3 \sqrt{5} + 7 \sqrt{5} = \\ = (2 + 3 + 7) \sqrt{5} = \\ = 12 \sqrt{5}$