Question

$frac{6-4√2}{√2-1}$ - 2√2

Answer 1

(6-4√2)/(√2 -1) -2√2 = (6-4√2- 2√2 *(√2-1))/(√2 -1) = (6 - 4√2 - 4 +2√2)/(√2 -1) =
= (2 - 2√2)/(√2-1)= -2*(√2-1)/(√2 -1) = -2 * 1 =-2