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x1+x2= -b/a
x1-x2= (akar (b^2-4ac))/2a
x1•x2= c/a
X^2+4x-4=0
x1+x2=-4/1=-4
x1-x2=( akar(4•4-4•1•(-4))/2•1=(akar(16+16))/2
= (akar 32)/2= 4 akar 2/2 = 2 akar 2
x1•x2= -4/1=-4