Question

qual as raízes da equação do segundo grau ×2+5×+62. _1 e 5, 2e5, 2 e_5, _2 e _5, _2 e 5​

Answer 1

Qual as raízes da equação do segundo grau x² + 5x + 6?

$\Delta=b^2-4ac=5^2-4\cdot1\cdot6=25-24=1\therefore\Delta=1\\\\x=\frac{-b\pm\sqrt{\Delta}}{2a} =\frac{-5\pm\sqrt{1}}{2\cdot1} =\frac{-5\pm1}{2} \\\\x'=\frac{-5+1}{2} =\frac{-4}{2} =-2\\\\x''=\frac{-5-1}{2}=\frac{-5-1}{2} =\frac{-6}{2}=-3\\\\\S=\{-3,\ -2\}$