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f(-1)=f(2)=-1
f(x)=a(x+2)(x-3)
f(-1)=a(-1+2)(-1-3)=-1
-4a=-1
a=1/4
Postac iloczynowa:
f(x)=1/4(x+2)(x-3)
1/4(x²-3x+2x-6)
Postac iloczynowa:
f(x)=1/4x²-1/4x-1,5