Question

encontre o discriminante e determine as raizes de x²-3x+2=0

Answer 1

$\Delta=b^2-4\cdot a \cdot c\\\Delta=(-3)^2-4\cdot1\cdot2\\\Delta=9-8\\\boxed{\Delta=1}$


$x=\dfrac{-b\pm\sqrt{\Delta}}{2a}=\dfrac{3\pm\sqrt1}{2}=\dfrac{3\pm1}{2}\Longrightarrow\begin{cases}x_1=2\\x_2=1\end{cases}$