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^delta= b^2-4ac
^delta= 9-4*(-1)*4=9 + 16 = 25
pierwiastek z ^ delta = 5
x1 = -b-pierwiastek z ^ / 2a
x1=-3 -5/2 =-8/2 = -4
x2=-3 +5 /2 =2/2=1
y= -1(x + 4)(x-1) postać iloczynowa
delta= 3^2-4*(-1)*4=25
pierwiastek z delty = 5
x1=-3-5/-2=-8/-2=4
x2=-3+5/-2=-1
y=-1(x+4)(x-1)