# How do you translate "3 times the difference of a number and one" into a mathematical expression?

Dec 11, 2015

$3 \left(x - 1\right)$

#### Explanation:

Since the expression is a DIFFERENCE, subtraction will be involved.

As an example, the difference of $7$ and $5$ would be written as $7 - 5$.

Therefore, the difference of a number and one can be represented by the expression $x - 1$, where $x$ can be equal to any number.

If we want to find $3$ times that difference, we multiply $3$ by what we already have:

$3 \left(x - 1\right)$

Note that this is also equal to $3 x - 3$ if we distribute the $3$.

Dec 11, 2015

Depending on the context you could also have: $3 \left(1 - x\right)$