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

1 Answer
May 14, 2018

Answer:

#|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"#