Question

3√2x + x√8x -5√18x

Answer 1

3√2x + x√8x -5√18x = 3√2x + x√(4*2x) -5√(9*2x)
= 3√2x + 2x√2x -(3*5)√2x
= ( 3+2x -15)√2x
= ( 2x-12)√2x

Answer 2

Hint...
\[\Large \sqrt{8x}=\sqrt{4}\cdot \sqrt{2x} \quad \quad , \quad \sqrt{18x}=\sqrt{9}\cdot \sqrt{2x}\]

\[\LARGE a\sqrt{x}+b\sqrt{x}=(a+b)\sqrt{x}\]