Question

(✓28-✓7)умножаем на✓7

Answer 1

28*7=196. √196=14. 14-7=7

Answer 2

$(\sqrt{2^2*7}-\sqrt{7}) *\sqrt{7}$

$(2\sqrt{7} -\sqrt{7} )*\sqrt{7}$

$\sqrt{7}*\sqrt{7}$

$\sqrt{7*7}$

$\sqrt{7^2}$

$7$