Respostas

2013-12-11T10:11:12-02:00
X²-5x-6=0
a= +1; b= -5; c= -6
Δ= b²-4ac
Δ= (-5)²-4.(+1).(-6)
Δ= +25+24
Δ= +49
 
x=  \frac{-b+/-[tex] \sqrt{b²-4ac}
x=  \frac{-(-5)+/- \sqrt{49} }{2.1}
x=  \frac{+5+/-7}{2}
x,= \frac{+5+7}{2} = \frac{12}{2} =6
x,,=  \frac{+5-7}{2} = \frac{-2}{2} =-1
logo, x,=6 e x,,=-1