Question

Adding x + 1, x – 1 and –x – 1, we get

3x
2x
x – 1
1 – x

Answer 1

Answer:

x - 1

Step-by-step explanation:

(x + 1) + (x - 1) + (-x - 1)

= x + 1 + x - 1 - x - 1

= (x + x - x) + (1 -1 -1)

= x - 1

Answer 2

Answer:

x+1+x-1+(-x-1)=x-1

Step-by-step explanation:

x+1+x-1+(-x-1)

=x+1+x-1-x-1

=2x-x+1-2

=x+(-1)

=x-1

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