Which statements are true about the graph of... y=4x^2-5x-4

1. Opens up
2. opens down
3. axis of symmetry x=-5/8
4. axis of symmetry x=5/8

a. 1 and 3 only
b. 2 and 3 only
c. 1 and 4 only
d. 2 and 4 only

Question

Which statements are true about the graph of... y=4x^2-5x-4

1. Opens up
2. opens down
3. axis of symmetry x=-5/8
4. axis of symmetry x=5/8

a. 1 and 3 only
b. 2 and 3 only
c. 1 and 4 only
d. 2 and 4 only

anonymous · Answer

Here's a site that shows the graph. http://www.wolframalpha.com/input/?i=y%3D4x^2-5x-4

anonymous · Answer

What do you think? Do you think it opens up or down based on the graph?

anonymous · Answer

On the top?

experimentx · Answer

y=4x^2-5x-4 = 4x^2 - 2*2*5/4x + (5/4)^2 - (5/4)^2-4
= (2x - 5/4)^2 - ((5/4)^2+4) = sqrt(2)(x-5/8)^2 - ((5/4)^2+4)

x -> inf, y ->inf
x -> -inf, y-> + inf
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