Plot these coordinates on the graph to get an idea of the shape of the graph.
The easiest way to graph a function is to use a graphing program or a graphing calculator.If the parabola starts at y = -4 and goes up, then the range is [-4, +∞). the codomain of the function, or the image of the function. In mathematics, the range of a function may refer to either of two closely related concepts. Sometimes 'range' refers to the image and sometimes to the codomain. In this case, the range is determined by the point the root function starts. is a function from domain X to codomain Y.The yellow oval inside Y is the image of. Some root functions will start above or below the x-axis.Many root functions have a range of (-∞, 0] or X Research source As you can see from my picture, the graph 'covers' all y-values that is, the graph will go as low as I like, and it will also go as high as I like.For any point on the y-axis, no matter how high up or low down, I can go from that point either to the right or to the left and, eventually, Ill cross the graph.
Oftentimes, it is easiest to determine the range of a function by simply graphing it.