X²+x=12
X²+X-12=0[tex]\Delta= b^2-4*a*c\\\Delta=1^2-4*a*(-12)\\\Delta=1-(-48)\\\Delta=49 [/tex]
agora aplicamos Bhaskara:
[tex]X=\frac{-b _-^+\sqrt\Delta}{2*a}\\X=\frac{-1_-^+\sqrt49}{2*1}\\X= \frac{-1^+_-7}{2}\\\\X_1=\frac{-1+7}{2}\\X_1=6/2\\X_1=3\\\\X_2=\frac{-1-7}{2}\\X_2= -8/2\\X_2=-4[/tex]
esse numero pode ser 3 ou -4
