SOLUTION: Tell whether the graph opens up or down write an equation of the axis of symmetry y=4x^2-4

Question 189883: Tell whether the graph opens up or down write an equation of the axis of symmetry
y=4x^2-4
Found 2 solutions by nerdybill, Mathtut:
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
Everything you need to know can be found at:
http://www.mathwarehouse.com/geometry/parabola/standard-and-vertex-form.php
.
y=4x^2-4
To tell whether it opens up or down -- look at the coefficient associated with the x^2 term: +4 -- since it is POSITIVE -- think smiley face -- U -- it opens UPWARDS.
.
The axis of symmetry is at:
x = -b/2a
x = -0/2(4)
x = -0/8
x = 0

Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!

:
opens up
axis of symmetry is x=0
:

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