find the vertex and the axis of​ symmetry,

Question

f(x)=−x²+4x+7, find the vertex and the axis of symmetry,

Answer 1

to find the x coordinate of the vertex of a quadratic function given in standard form, as you have here,

x = -b/(2a).  Do that!

 

to find the y coordinate of the vertex, evaluate y = f(x_vertex).

 

the axis of symmetry has equation x = x_vertex