Resposta:
[tex]x_{1}=5\\ x_{2}=-1[/tex]
Explicação passo a passo:
Usa Bhaskara: [tex]a=-1[/tex], [tex]b=4[/tex] e [tex]c=5[/tex]
Δ[tex]=d=b^{2}-4ac[/tex]
[tex]=4^{2}-4.(-1).5\\ =16+20\\ =36[/tex]
[tex]x_{1}=\frac{-b-\sqrt{d} }{2a}\\x_{1}=\frac{-4-\sqrt{36} }{2.(-1)}\\x_{1}=\frac{-4-6}{-2}\\x_{1}=\frac{-10}{-2}\\x_{1}=5\\\\x_{2}=\frac{-b+\sqrt{d} }{2a}\\x_{2}=\frac{-4+\sqrt{36} }{2.(-1)}\\x_{2}=\frac{-4+6}{-2}\\x_{2}=\frac{2}{-2}\\x_{2}=-1\\[/tex]
