Question

What is the axis of symmetry of the graph of y = -3(x + 8)2 + 5?

Answer 1

What's the axis of symmetry of y = x^2 ? It's the y-axis, or the line x = 0

What's the axis of symmetry of y = ax^2? The same, the line x = 0.

The axis of symmetry of y = ax^2 + c? The same, x = 0

Axis of symmetry of y =(x-1)^2 ? x = 1

Of y = a(x-1)^2 ? x = 1

Of y = a(x-1)^2 + b? x = 1

Answer 2

What then is the axis of symmetry of

y = (x + 8)^2

?

Answer 3

hint: (x+8)^2 = ( x - (-8) )^2

Answer 4

any ideas?