Question

2(8+rad.18) -3 (4+rad.8)

Answer 1

2(8 + √18) - 3(4 + √8) = 
2(8 + 3√2) - 3(4 + 2√2) = 
16 + 6√2 - 12 - 6√2 = 
4

Answer 2

16 +2$\sqrt{18}$ - 12 - 3$\sqrt{8}$ 
[tex] \sqrt{18} = \sqrt{9*2} = 3 \sqrt{2} [/tex]
$\sqrt{8} = \sqrt{4*2} = 2 \sqrt{2}$
16+ 6$\sqrt{2}$ -12 -6$\sqrt{2}$ = 16 -12 = 4