Question

упростить
√50 − 2 √18

Answer 1

$\sqrt{50} - 2 \sqrt{18} = \sqrt{25 \times 2} - 2 \sqrt{9 \times 2} = \sqrt{25} \times \sqrt{2} - 2 \times \sqrt{9} \times \sqrt{2} = 5 \sqrt{2} - 2 \times 3 \sqrt{2} = 5 \sqrt{2} - 6 \sqrt{2} = - \sqrt{2}$