Question

If f(x)=-x^2-4x-k and contains the point (-4,3), what is the y coordinate of the function at the point on the axis of symmetry of the graph?

Answer 1

@zzr0ck3r

Answer 2

@Directrix

Answer 3

These are NOT SAT practice problems.

Answer 4

f(x)=-x^2-4x-k and contains the point (-4,3),
3 = - (-4)^2 - 4(-4) - k

@sakigirl Solve the above equation for k.

Answer 5

@sakigirl k = ?

Answer 6

>the point on the axis of symmetry
The axis of symmetry is a line and is composed of infinitely points. So, I don't know what the reference to THE point is.

Answer 7

the point is needed to calculate k

Answer 8

f(x) = -x^2 - 4x - k

at (-4, 3):
3 = -(-4)^2 -4(-4) - k
3 = -16 + 16 - k
3 = -k
k = -3

Answer 9

Now you'll have to convert this into a form where you know the vertex point(this will tell you what the axis of symmetry is).