Question

X2-9x-12=0 me ajudem a resolver essa equação do 2grau ?

Answer 1

x²-9x-12=0
$\frac{9+- \sqrt{9^2-4*1*(-12)} }{2*1} = \frac{9+- \sqrt{129} }{2}$

x1= $\frac{9+ \sqrt{129} }{2}= 10,18$

x2= $\frac{9- \sqrt{129} }{2}= -1,18$