Which function has a vertex at the origin? f(x) = (x + 4)2 f(x) = x(x – 4) f(x) = (x – 4)(x + 4) f(x) = –x2

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(1) Answers

CassKnight

f(x) = -x^2 would have a vertex at the origin.
The equation for a parabola where the vertex is NOT at the origin, but is at (h, k) is:
f(x) = (x-h)^2 + (y-k)^2
If options 2 & 3 were simplified they would have an (h,k) that is not (0,0)