Question

Rewrite the equation y=-x^2+4x in vertex form. What is the vertex and the axis of symmetry?

a. y=-1(x-2)^2+4 vertex: (2, 4); axis of symmetry: x = 2
b. y=-1(x-2)^2+4 vertex: (–2, 4); axis of symmetry: x = –2
c. y=-1(x+2)^2-12 vertex: (–2, –12); axis of symmetry: x = –2
d. y=-1(x-4)^2+0 vertex: (4, 0); axis of symmetry: x = 4