sqrt(17-12sqrt(2)) * (6+4sqrt(2)) Очень нужно

sqrt(17 - 12*sqrt(2))*(6 + 4*sqrt(2)) = sqrt(9 - 2*3*2*sqrt(2) + 8)*2*(3 + 2*sqrt(2)) = sqrt(3^2 - 2*3*2*sqrt(2) +(2*sqrt(2) )^2)*2*(3 + 2*sqrt(2)) = 2*sqrt( (3 - 2*sqrt(2))^2 )*(3 + 2*sqrt(2)) = 2*(3 - 2*sqrt(2))*(3 + 2*sqrt(2)) = 2*(3^2 - (2*sqrt(2))^2)=2*(9 - 8) = 2.