123

a)
3x^2-6x+3=3\left(x-1\right)\left(x-1\right)
b)
2x^2-7x-4
lasketaan nollakohdat
x=4\ tai\ x=-\frac{1}{2}
2\left(x-4\right)\left(x+\frac{1}{2}\right)
c)
x^3-2x^2+3x
x\left(x^2-2x+3\right)