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10 cards from this deck
Standard form to vertex form
a(x−h)2+ka(x - h)^2 + ka(x−h)2+k
(h,k)(h, k)(h,k)
x=hx = hx=h
Halve it, then square it
Factor out aaa from first two terms
h=−3h = -3h=−3
Upward
Perfect square trinomial
Forgetting to subtract what you added
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