\(\Delta=\left(-7\right)^2-4.3.1=49-12=37\)
\(x_1=\dfrac{-\left(-7\right)+\sqrt{37}}{2.3}=\dfrac{7+\sqrt{37}}{6}\)
\(x_1=\dfrac{-\left(-7\right)-\sqrt{37}}{2.3}=\dfrac{7-\sqrt{37}}{6}\)
\(\Delta=\left(-7\right)^2-4\cdot3\cdot1=49-12=37\)
Do đó: Phương trình có hai nghiệm phân biệt là:
\(\left\{{}\begin{matrix}x_1=\dfrac{7-\sqrt{37}}{6}\\x_2=\dfrac{7+\sqrt{37}}{6}\end{matrix}\right.\)