anonymous one year ago Use the quadratic equation y = x2 + 3x + 9. Where does the vertex of the parabola lie? A. on the y-axis B. below the x-axis C. above the x-axis D. on the x-axis

1. anonymous

@LynFran

2. anonymous

its A right

3. amoodarya

$y=f(x)=ax^2+bx+c\\x_{vertex}=\frac{-b}{2a}\\y_{vertex}=f(\frac{-b}{2a})$

4. anonymous

no its not A its below the axis

5. LynFran

above the x axis

6. anonymous

so C hmm ok