Question

Find the range of the quadratic function.
f(x) = (x + 8)^2 - 7

A. [-7, ∞)

B. (-∞, -8]

C. [-8, ∞)

D. (-∞, -7]

Answer 1

The answer i picked was A.

Answer 2

It's a parabola opening `upward`.
So it will increase towards positive infinity.

But where is the vertex located? The smallest value y can take?
Well it's normally at y=0, but our function has been shifted `downward 7 units`.

So our smallest y value is -7, which no boundary on the upper.

Yes, good job ninja girl! c:

Answer 3

thanks @zepdrix

Answer 4

@zepdrix is right
@Luis_Rivera x=0 ?? it is not important to find the range

Answer 5

thanks @julian25 :-)