Question

-x²+×+12=0
queria saber o resultado fazendo um fvr ​

Answer 1

Resposta:

$equacao~do~segundo~grau\\ \\ -x^{2} +x+12=0\\ \\ coeficientes:~~a=-1,~~b=1,~~c=12\\ \\ Formula~de~Bhaskara\\ \\ x=\frac{-b+-\sqrt{b^{2}-4.a.c } }{2.a} \\ \\ delta=b^{2} -4.a.c\\ \\ delta=1^{2} -4.(-1).12\\ \\ delta=1-(-48)\\ \\ delta=49$

$x=\frac{-b+-\sqrt{delta} }{2.a} \\ \\ x=\frac{-1+-\sqrt{49} }{2.(-1)} \\ \\ x=\frac{-1+-7}{-2} \\ \\ x'=\frac{-1+7}{-2}-\frac{6}{-2} =-3\\ \\ x''=\frac{-1-7}{-2} =\frac{-8}{-2} =4\\ \\ \\ S~~\left \{ {{x'=-3;} \ {~~~x''=4}} \}$