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

1 Answer

May 14, 2018

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

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

Explanation:

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

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

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

WE DO THIS:

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

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