a) x^2 - 5x - 6 =x^2+x-6x-6=x(x+1)-6(x+1)=(x+1)(x-6)
б) -3x^2 + 14x + 5 =-3(x-5)(x+1/3)=-(x-5)(3x+1)
D=b^2-4ac=14^2-4*(-3)*5=196+60=256=16^2
x=(-14-16)/(-6)=5
x=(-14+16)/(-6)=-1/3
a) x^2 - 5x - 6 =x^2+x-6x-6=x(x+1)-6(x+1)=(x+1)(x-6)
б) -3x^2 + 14x + 5 =-3(x-5)(x+1/3)=-(x-5)(3x+1)
D=b^2-4ac=14^2-4*(-3)*5=196+60=256=16^2
x=(-14-16)/(-6)=5
x=(-14+16)/(-6)=-1/3