Question

Help me pleas i dont get it

Answer 1

I got you!!!!!!!!!!!!!!!

Answer 2

$\bf \sqrt{28}\cdot \sqrt{176}~~ \begin{cases} 28=2\cdot 2\cdot 7\\ \qquad 2^2\cdot 7\\ 176=2\cdot 2\cdot 2\cdot 2\cdot 11\\ \qquad 2^2\cdot 2^2\cdot 11\\ \qquad (2^2)^2\cdot 11 \end{cases}\implies \sqrt{2^2\cdot 7}\cdot \sqrt{(2^2)^2\cdot 11} \\\\\\ 2\sqrt{7}\cdot 2^2\sqrt{11}\implies 2\sqrt{7}\cdot 4\sqrt{11}\implies 8\sqrt{7\cdot 11}\implies 8\sqrt{77}$