Question

x2-7x-2=0 sendo 2 grau

Answer 1

$x^2-7x-2=0$

Resolvendo pela fórmula de Bhaskara, anexa

a=1   b=-7  c=-2$delta = (-7)^2-4.1(-2)=49+8=57 \\ \\ \sqrt{delta} = \sqrt{57} \\ \\ x_{1} = \frac{-(-7)+ \sqrt{57} }{2.1} = \frac{7+ \sqrt{57} }{2} \\ \\ x_{2} = \frac{-(-7)- \sqrt{57} }{2.1}= \frac{7- \sqrt{57} }{2}$

S={$\frac{7+ \sqrt{57} }{2} ; \frac{7- \sqrt{57} }{2}$}