Question

3 корень72- 8 корень 2=

Answer 1

$=3 \sqrt{36*2} -8 \sqrt{2} =3*6 \sqrt{2} -8 \sqrt{2} =18 \sqrt{2} -8 \sqrt{2} =10 \sqrt{2}$

Answer 2

$3 \sqrt{72}-8 \sqrt{2} =3 \sqrt{4*9*2} -8 \sqrt{2} =2*3*3 \sqrt{2} -8 \sqrt{2}= \\ = 18\sqrt{2} -8 \sqrt{2} =10 \sqrt{2}$