Question

Can some one help with two questions

1) Which expression is not equivalent to the other expressions?

-6(2x - 4)
-(12x - 6) + 18
-3(4x - 3) + 15
-4(3x + 6)

2) All of the following are equivalent except _____.

-5(x - 1)
-5x + 5
5 - 5x
(5 - 5)x

Answer 1

1. -4(3x + 6)
2. (5 - 5)x

Explanation:

These are fairly easy to see when each expression is put into the same simplified form.

1.

-6(2x -4) = -12x +24

-(12x -6) +18 = -12x +24

-3(4x -3) +15 = -12x +24

-4(3x +6) = -12x -24 . . . . not equivalent

2.

-5(x -1) = -5x +5

-5x +5 = -5x +5

5 -5x = -5x +5

(5 -5)x = 0 . . . . not equivalent