x²-2-1=2x
x²-2x-3=0
x1+x2 = 2
x1×x2 = -3
x1 = -1
x2 = 3
y = -1² -2
y = -1
y = 3² -2
y = 7
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x²-2-1=2x
x²-2x-3=0
x1+x2 = 2
x1×x2 = -3
x1 = -1
x2 = 3
y = -1² -2
y = -1
y = 3² -2
y = 7