Question

All of the following are equivalent, except _____.

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

Answer 1

The answer is:

A

Work/explanation:

Let's take the time to simplify each of these expressions and see which ones are equivalent.

`\mathbb{OPTION~A}`

`\sf{(12+3x)x}`

Simplify by distributing x:

`\sf{12x+3x^2}`

__________

`\mathbb{OPTION~B}`

`\sf{12x+3x}`

Combine like terms:

`\sf{15x}`

__________

`\mathbb{OPTION~C}`

distribute x

`\sf{(12+3)x}=12x+3x=15x}`

___________

`\mathbb{OPTION~D}`

Nothing can be done to simplify the expression 15x.

Hence, the "odd one out" is A, as it's not equivalent to the others.

Answer 2

x = 5

so that means the solution

Explanation:

45x16+3X14+12x13=x918