## tmybby one year ago Help?? What are the vertex and the axis of symmetry of the equation? y = –2x2 + 8x – 18 a. vertex: ( 2, –10) axis of symmetry: x = 2 b. vertex: (2, –10) axis of symmetry: x = –10 c. vertex: (–2, –10) axis of symmetry: x = –2 d. vertex: (–2, 10) axis of symmetry: y = –2

1. satellite73

$y=ax^2+bx+c$ $y = –2x^2 + 8x – 18$ first coordinate of the vertex is always $$-\frac{b}{2a}$$ in your case it is $$-\frac{8}{2\times (-2)}=2$$

2. satellite73

second coordinate is what you get if you replace $$x$$ by $$2$$

3. tmybby

oh ok so it's A?