Question

упростить
√50 − 2 √18

Answer 1

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