L O.

asked • 01/10/14

how to identify the axis

how would I identify the axis of symmetry and the vertex using
 
          y = x^2 - 4x -32
 
 
please show steps

3 Answers By Expert Tutors

By:

Murtaza N. answered • 01/10/14

Tutor
New to Wyzant

Math, Physics, Computer Programming, & Test Prep!

Parviz F. answered • 01/10/14

Tutor
4.8 (4)

Mathematics professor at Community Colleges

Vivian L.

Hi Parviz;
I believe x=-b/2a is the axis of symmetry, not y=-b/2a, as you explain.
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01/10/14

Steve S.

One way to remember this is with the Quadratic Formula:
 
x = (-b±√(b^2-4ac))/2/a = -b/2/a ±√(b^2-4ac))/2/a
 
The roots are equal distances from the value x = -b/2/a.
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01/10/14

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