# If x=2, y= -5, and z= -1, then what does (x-y) (x+y-z) equal?

##### 1 Answer

#### Explanation:

First, substitute the values of

Next, we remove unnecessary addition and subtraction signs to complete the expression.

#- and + = -# #- and - = +# #+ and + = +#

So

Next, we complete the expressions inside the brackets (order of operations).

Finally, to complete the expression, we carry out the multiplication: