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(x-3)(x+3)=0
x1=3 x2=-3
b)3x^3-x^2=0
x^2(3x-1)=0
3x^2(x-1/3)=0
x1=0 x2=1/3
c) 2x^2-3x+1=0
d=3^2-4*2*1
d=1
=1
x1=3-1/4=1/2 x2=3+1/4=1
d)x^3-3x^2-x+3=0
x^2(x-3)-(x-3)=0
(x^2-1)(x-3)=0
(x-1)(x+1)(x-3)=0
x1=1
x2=-1
x3=3