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Alpha×Beta = c/a
Alpha×Beat = 3/1
Alpha×Beta = 3
Alpha+Beta = -b/a
Alpha+Beta = -7/1
Alpha+Beta = -7
(Alpha+Beta)^2 = (-7)^2
Alpha^2+Beta^2+2Alpha×Beta = 49
Alpha^2+Beta^2+2×3 = 49
Alpha^2+Beta^2=49-6
Alpha^2+Beta^2=43
(Alpha-Beta)^2=Alpha^2+Beta^2-2Alpha×Beta
(Alpha-Beta)^2=43-2×3
(Alpha-Beta)^2=43-6
(Alpha-Beta)^2=37