Resposta:
Explicação passo a passo:
[tex]x^{2}-5x+6\\\\x=\frac{-b+-\sqrt{b^{2}-4ac} }{2a}\\\\x=\frac{-(-5)+-\sqrt{(-5)^{2}-4*1*6} }{2*1}\\\\x=\frac{5+-\sqrt{25-24} }{2}\\\\x=\frac{5+-1}{2}\\\\x = 3\ ou\ x = 2[/tex]
