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b) [(6-20^1/2)^1/2-(6+20^1/2)^1/2]^2 = [(-14/2)/2-(26/2)/2]^2 = [(-7)/2-13/2]^2 = [(-3,5)-6,5]^2 = -10^2 = 100
c) [(6-11^1/2)^1/2+(6+11^1/2)^1/2]^2 = [(-5/2)/2+(17/2)/2]^2 = [-2,5/2+8,5/2]^2 = (-1,25+4,25)^2 = 3^2 = 9
d) [(7+24^1/2)^1/2-(7-24^1/2)^1/2]^2 = [(31/2)/2-(-17/2)/2]^2 = [15,5/2+8,5/2]^2 = (7,75+4,25)^2 = 12^2 = 144