Question

O VÉRTICE DA PARABOLA a)y=x²-4x+13 É???

Answer 1

 Na abscissa, 

$\\X_v=\frac{-b}{2a}\\\\X_v=\frac{-(-4)}{2\cdot1}\\\\X_v=\frac{4}{2}\\\\\boxed{X_v=2}$


 Na ordenada,

$\\Y_v=\frac{-\Delta}{4a}\\\\Y_v=\frac{-(b^2-4ac)}{4\cdot1}\\\\Y_v=\frac{-(16-52)}{2}\\\\Y_v=\frac{-(-36)}{4}\\\\Y_v=\frac{36}{4}\\\\\boxed{Y_v=9}$