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a)
f\left(x\right)=\left(x+2\right)\left(x-3\right)
x^2-3x+2x-6
x^2-x-6
b)
nollakohdat x=-1 ja x=4
f\left(x\right)=\left(x+1\right)\left(x-4\right)
x^2-4x+x-4
x^2-3x-4
c)