Posted by **Suzannah** on Thursday, October 10, 2013 at 9:23pm.

What does "c ≠ 0" mean? I've heard the "≠" sign means "does not equal." Does this mean that c ≠ 0 means that "(variable) does not equal zero"? What is it's usage?

- Math Question -
**Reiny**, Friday, October 11, 2013 at 12:24am
yes, it means "not equal"

suppose you had

y = 4/(x-5) and you wanted the domain of the function

that is, what values of x could I use ??

Well, we could use any real number for x, except 5

and we would write it as:

x = any real number, x ≠ 5

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