Question

What are the vertex and the axis of symmetry of the equation?

y = –2x2 + 8x – 18


vertex: ( 2, –10)
axis of symmetry: x = 2

vertex: (2, –10)
axis of symmetry: x = –10

vertex: (–2, –10)
axis of symmetry: x = –2

vertex: (–2, 10)
axis of symmetry: y = –2

Answer 1

u have to complete the square:
\[ \large y=-2x^2+8x-18 \]
\[ \large y+18\color{red}{-8}=-2(x^2-4x\color{red}{+4}) \]
\[ \large y+10=-2(x-2)^2 \]

Answer 2

So , its the last one , rite ?

Answer 3

& thank you for showing me how to do it (: