Which of the quadratic functions has the widest graph? y = 0.3x2 y = - 4x2

A vertical stretching is the stretching of the graph away from the x-axis.

A vertical compression is the squeezing of the graph towards the x-axis.

A compression is a stretch by a factor less than 1.

For the parent function y = f (x), the vertical stretching or compression of the function is a f (x).

If | a | < 1 (a fraction between 0 and 1), then the graph is compressed vertically by a factor of a units.

If | a | > 1, then the graph is stretched vertically by a factor of a units.

For values of a that are negative, then the vertical compression or vertical stretching of the graph is followed by a reflection across the x-axis.

Thus, the equation with the widest graph is 0.3x^2.