x+y=-2 xy=3,(x-y)²
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x+y=-2 xy=3,(x-y)²
x+y=-2 xy=3,(x-y)²
x+y=-2 xy=3,(x-y)²
(x-y)²
=(x+y)^2-4xy
=(-2)^2-4*3
=4-12
= -8
(x-y)^2=(x+y)^2-4xy=4-4*3=-8
x+y=-2 xy=3,(x-y)²
x+y=-2 xy=3,(x-y)²
x+y=-2 xy=3,(x-y)²
(x-y)²
=(x+y)^2-4xy
=(-2)^2-4*3
=4-12
= -8
(x-y)^2=(x+y)^2-4xy=4-4*3=-8