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2010-03-14T23:27:44+01:00
A)
2x-y = 2(3√2-3)-(2+4√2)= 6√2-6-2-4√2= 2√2-8

b) x² = (3√2-3)²= 9*2-2*3*3√2+9=18-18√2+9=27-18√2

c) x/y = (3√2-3)/(2+4√2)=(3√2-3)*(2-4√2)/(2+4√2)*(2-4√2)=
(6√2-12*2-6+12√2)/(4-8√2+8√2-16*2)=(18√2-30)/(4-32)=(18√2-30)/-28=
(9√2-15)/-14