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a=2,b=-4,c=-3
-----------------------------------
a+b = = = 4
a.b = =
-----------------------------------
X1 = a-3
X2 = b-3
_____________ +
X1 + X2 = a + b - 6
= 2-6
= -4
X1.X2 = (a-3)(b-3)
= ab-3a-3b+9
= -3(a+b) + 9
= -3(-3) + 9
= +9 +9
= +18
= +
=
------------------------------------
==> x²-(X1+X2)x +(X1.X2) =0
x²-(-4)x +
(x²+4x+ =0)x2
= 2x²+8x+33=0