Question

How do you write the mathematical expression for "the difference of 7 and a number n"?

Answer 1

`|7-n| =" positive difference"`

If you wish to indicate if n is less than or greater then 7 then you do this: `7-n`

Explanation:

If `n>7` then we have `n-7` which is positive

If `n<7` then we have `7-n` which is also positive.

So how do we end up with a positive answer no matter what the value of `n` is.

WE DO THIS:

`|7-n| =" positive difference"`