х2-7х+4=0
D= 7^2-4×4=33
х1= (7+√33)/2
х2=(7-√33)/2
3х1+3х2-2х1х2
3((7+√33)/2)+3((7-√33)/2)-2((7+√33)/2))((7-√33)/2) = (3(7+√33)+3(7-√33))/2-2(((7+√33)(7-√33))/4) = (21+3√33+21-3√33)/2-2((49-33)/4) = (27+21)/2 - 2(16/4) = 48/2-2×4 = 24-8 = 16
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х2-7х+4=0
D= 7^2-4×4=33
х1= (7+√33)/2
х2=(7-√33)/2
3х1+3х2-2х1х2
3((7+√33)/2)+3((7-√33)/2)-2((7+√33)/2))((7-√33)/2) = (3(7+√33)+3(7-√33))/2-2(((7+√33)(7-√33))/4) = (21+3√33+21-3√33)/2-2((49-33)/4) = (27+21)/2 - 2(16/4) = 48/2-2×4 = 24-8 = 16