# How do you simplify #(x-y+1)-(x+y-1)#?

##### 2 Answers

Sep 10, 2016

#### Explanation:

The terms in the 1st bracket are being multiplied by 1 , while each of the terms in the 2nd bracket are being subtracted.

That is

#1(x-y+1)-x-(+y)-(-1)# simplifying gives.

#x-y+1-x-y+1# and collecting like terms.

#cancel(x)+(-y-y)+(1+1)cancel(-x)=-2y+2#

Sep 10, 2016

#### Explanation:

We have:

Let's expand the parentheses:

Then, let's group the like terms: