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

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

Question

Find the axis of symmetry of the graph of the function.

f(x) = 3x^2 + 12x + 7

abb0t · Answer

It's a parabola

anonymous · Answer

so how would I find the axis of symmetry?

mathmate · Answer

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).

anonymous · Answer

is the formyla -b/2a ?

mathmate · Answer

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

anonymous · Answer

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

mathmate · Answer

"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"

mathmate · Answer

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

anonymous · Answer

Oh haha wow thank you!

mathmate · Answer

yw!