[tex]-x2-8x-15=0[/tex]
x^2+8x+15=0
D=64-60=4
x1=(-8-2)/2=-5
x2=(-8+2)/2=-3
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x^2+8x+15=0
D=64-60=4
x1=(-8-2)/2=-5
x2=(-8+2)/2=-3