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x1*x2 = c/a = -4/2 = -2
a pers : (x-1/2) (x+2) =0
x²+3/2x-1 =0
2x²+3x-2 =0
b. 1/(x1*x2) = 1/-2 = -1/2
1/x1+1/x2 = (x1+x2)/ (x1*x2) = (1/2)/-2 = -1/4
pers : (x+1/2) (x+1/4)=0
x²+3/4x+1/8 =0
8x²+6x+1 = 0