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Δ=4+12=16
√Δ=4
x1=-2-4/2=-3
x2=-2+4/2=1
x²+6x+9=(x+3)²
(x+3)(x-1) (x-1)
--------------= ---------------
(x+3)² (x+3)
b)
2x²+x-1
Δ=1+8=9
√Δ=3
x1=-1-3/4=-1
x2=-1+3/4=1/2
(x+1)(x-1/2) (x-1/2)
--------------------= ------------------------
(x-1)(x+1) (x-1)