Question

All of the following expressions are equivalent except:
A. 2-x
B. x-2
C. -2+x
D. x + (-2)

Answer 1

A, sub in a random number as x in all equations and solve, eg- x= 3
2-3= -1
3-2=1
-2 +3= 1
3-2=1

Answer 2

Answer:

  A.  2-x

Step-by-step explanation:

There are a number of ways you can look at this. You can look at the sign of 2, or you can look at the sign of x, or you can rewrite all of the expressions in standard form (decreasing powers of x). In standard form, we have ...

  A: -x +2

  B: x -2

  C: x -2

  D: x -2

Clearly, the different expression is choice A.