## aussy123 3 years ago Find the vertex for the equation: y = 3x2 + 18x + 30 (-3, 3) (-3, -51) (3, 111)

1. terenzreignz

If your quadratic equation is of the form $y = ax^{2} + bx + c$ Then the x=value of your vertex is given by the formula $-\frac{b}{2a}$

2. terenzreignz

And to find the y-value, either you plug in what you got for the x-value, or follow this formula $\frac{4ac-b^{2}}{4a}$

3. aussy123

ok thanks, I see!!