Widest to narrowest quadratic functions graph

Question

4x^2,-2x^2,-6x^2

Answer 1

Let f(x) = 4x^2,   g(x) = -2x^2,   h(x) = -6x^2.

 

The 'tightest' of these three functions is h, the least tight is g, based on the absolute value of the leading (only) coefficients.  Only f opens upwardly.