how do you find the axis of symmetry of −4(x − 8)2 + 3

Question

noelgreco · Answer

Check the expression.  Is it -8(x-8)+3?

anonymous · Answer

no its −4(x − 8)^2 + 3

noelgreco · Answer

It's in vertex form.  The axis of symmetry is x= the x-coordinate of the vertex.

anonymous · Answer

so the vertex is (8,3)

anonymous · Answer

@NoelGreco

anonymous · Answer

ooh so the axis of symmetry would be 8? @NoelGreco ?

whpalmer4 · Answer

no, axis of symmetry would be $x = 8$

noelgreco · Answer

Actually, x = 8 is the equation for the line that is the axis of symmetry.

anonymous · Answer

so 8 is the axis of symmetry?

whpalmer4 · Answer

No, the line $x=8$ is the axis of symmetry.

whpalmer4 · Answer

attachment

whpalmer4 · Answer

just saying "8" is insufficient. it might also be $y = 8$ if we had a parabola that opened to the left or right!

anonymous · Answer

ooh yes yes correct i understand now thank you!!

whpalmer4 · Answer

nothing worse that doing the problem correctly and then not getting credit because you didn't nail down exactly what you meant with your answer, or rounded wrong, or anything like that.  Be picky!  Then re-read the question again, just to be sure you've really answered the right thing.

anonymous · Answer

that is totally correct im with you 100% i would've hated it if i would've gotten it wrong just cause of that