Question

Find the axis of symmetry of the graph of the function.

f(x) = 3x^2 + 12x + 7

Answer 1

It's a parabola

Answer 2

so how would I find the axis of symmetry?

Answer 3

Try completing squares to transform f(x) into f(x)=a(x-h)^2+k
then x=h is the line of symmetry (passing through the vertex).

Answer 4

is the formyla -b/2a ?

Answer 5

yes, you could use the formula as well,
x=-b/2a

Answer 6

So I got -2 when I used that formula.... then what do I do?

Answer 7

"Try completing squares to transform f(x) into f(x)=a(x-h)^2+k
then x=h is the line of symmetry (passing through the vertex)."

"yes, you could use the formula as well,
x=-b/2a"

Answer 8

When attempting math problems, whenever in doubt, reread the question!
Also recall that "an axis of symmetry" is a line.

Answer 9

Oh haha wow thank you!

Answer 10

yw!