Question 145443
2-2√2/2+2√2
=2(1-sqrt(2))/2(1+sqrt(2))
=(1-sqrt(2))/(1+sqrt(2))
={{{((1-sqrt(2))/(1+sqrt(2)))*((1-sqrt(2))/(1-sqrt(2)))}}}
=(1-sqrt(2))^2/(1-2)
=(1-2sqrt(2)+2)/-1
=-3+2sqrt(2)
.
Ed