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the vertex is (-h, k) isn't it? so the vertex should be (-2, 5)

ah no

5x^2 – 20 = 0
5x^2 = 20
x^2 = 4
sqrt(x^2) = +/- sqrt(4)
x = +/- 2

so the second one is d

does that make sense?

yes.

ok :]

what about the first one ?

look at my first post