what is 15 diivided by0?

15/0 is undefined.

If a is a real number, a/0 is undefined.

Any number divided by zero is undefined (not infinity!). Here's why:

Start with a division a/b, where a = 15 and b = 1. Okay, the answer is 15, right? Now let b = 0.1, and the solution is 150. Let b = 0.01, and the answer is 1500. The smaller b gets, the larger a/b gets, right? So it seems that as b approaches zero, a/b approaches infinity.

Except for one problem; if b is negative, then 15/b approaches *negative* infinity as b approaches zero. So the limit of a/b as b --> zero is different, depending on which direction you're approaching from.

When that happens, we say that an expression is "undefined". There simply is no number or value that is equivalent to a/0, where a is equal to any real number.

Here's another way to think about it. If a/b = c, then b*c = a, right? So let's say that 15/0 = c, where c is some real answer. Rewriting the equation we get 0*c = 15. But that's nonsense! Zero times *anything* is zero, not fifteen! There's no value for c that would make that equation work.

In the You-Didn't-Ask-But-I'm-Going-To-Mention-It-Anyway Department, 0/0 is *also* undefined. For example, 0/0 = c. Rearranging we get: 0*c = 0. Now we have the opposite problem: there are literally *infinite* numbers that you could substitute for c to make the equation work. We say that 0/0 is indeterminate and undefined, because it has no single real solution.

I hope that helps. Good luck!

'Unresolved' !!!!
15/ 0

Nice work...

15/0 => infty

15 / 0 is undefined like infinite as one example

15/0=infinite. any number divided by zero is infinite.

Undefined.

My allowance...0

15