Simplify the expression $7\sqrt{u}+3\sqrt{u}$7√u+3√u.
Simplify the expression: $\sqrt{10}+10\sqrt{10}$√10+10√10
Simplify the expression: $-19\sqrt{5}+4\sqrt{5}$−19√5+4√5
Simplify: $18\sqrt{2}-10\sqrt{2}+20\sqrt{2}$18√2−10√2+20√2