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):
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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.
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The axis of symmetry is at:
x = -b/2a
x = -0/2(4)
x = -0/8
x = 0
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