GED® Math Test Tutor by Sandra Rush

Author:Sandra Rush
Language: eng
Format: epub
Publisher: Research & Education Association
Published: 2017-04-11T04:00:00+00:00

The quadratic equation y = ax2 + bx + c is a function. As we showed in Chapter 4, when y = 0, the graph crosses the x-axis. Those x values are the roots (answers or solutions) of a quadratic equation.

Instead of using y, functions are usually indicated by F(x) or f(x), which are interpreted as “function of x,” where x is a variable. Functions (and, of course, variables) can be indicated by any letter, however. The idea is the same.

We actually encountered a function when we graphed the linear equation y = x – 2, which also could have been written as f(x) = x – 2. For a relation to be a function, each value of x, the domain, will give one (and only one) value for y, the range. So for f(x) = x – 2, if x = 1, f(x) = – 2 and cannot also equal another value.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.