Question

All of the following are equivalent, except _____.

(12 + 3)x
12x + 3x
(12 + 3x)x
15x

Answer 1

1. Given (12+3)x, we can sum the numbers in the parenthesis to get 15x

2. Given 12x+3x, we can factor x to get (12+3)x and get the same as 1.

3. Given (12+3x)x, we have to distribute the x and we have
`12x+3x^2`

4. This expression is already simplified.

Answer 2

(12+3x)x

Explanation:

(12+3)x = 15x

12x+3x = 15x

15x= 15x

(12+3x)x = 12x+3x^2