Question

Which expression represents, twice the difference of two numbers?1. 2(x + y) 2. 2 - x - y3. 2x – y4. 2(x - y)

Answer 1

4. 2(x - y)

Explanation:

We are required to find a mathematical expression for the statement: Twice the difference of two numbers.

Begin by picking two variables to represent the numbers.

Let the two numbers be x and y.

The difference between any two numbers is the subtraction of one from the other.

`\text{The difference=x-y}`

The word twice means to multiply by 2. Therefore:

`\text{Twice the difference}=2(x-y)`

The required expression is 2(x-y).

Option 4 is correct.