Question

-2x - 5+x²=0 ...,........​

Answer 1

-2x - 5+x²=0                        a = 1     b = -2    c= -5

Agora e usar Bhaskara:

$x=\frac{-(-2) +- \sqrt{(-2)^{2} -4.1.(-5)} }{2.1} \\\\\\x=\frac{2 +- \sqrt{4-(-20)} }{2}\\\\\\\x=\frac{2 +- \sqrt{24} }{2}\\\\\\\x= \frac{2 +- \sqrt{24} }{2}\\\\\\\x= \frac{2 +- 2\sqrt{6} }{2}\\\\\\\\x= \frac{2 +- 1\sqrt{6} }{2}\\\\\\\\Logo:\\\\\\\\x'= \frac{2 + 1\sqrt{6} }{2}= 1+\sqrt{6} \\\\\\x= \frac{2 - 1\sqrt{6} }{2}= 1-\sqrt{6}$

Espero ter ajudado bons estudos! :-)