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x^2 + 6x + 5 = 0
delta = b^2-4ac= 36-4*1*5=36-20=16
pierwiastek z delty= 4
x1 = (-b+pierwiastek z delty) / 2a = (-6+4) /2 = -2/2= -1
x2 = (-b- pierwiastek z delty) / 2a = (-6-4) / 2 = -10/2 = -5
Więc
x1= -1 a x2= -5
a>0 więc ramiona do góry
(załącznik)
x należy ( -5, -1 )