Question

Twice the difference of 9 and a number.

Answer 1

2(x−9)

Explanation:

The difference of a number and 9 is (x−9) Twice the difference means 2(x−9) We know that the answer to this is 2 , so as an equation: 2(x−9)=2.

Answer 2

The difference of a number and 9 is (x−9).

Twice the difference means 2(x−9).

We know that the answer to this is 2, so as an equation:

2 ( x - 9 )

If you solve it we would have:

x - 9= 1

x= 1 + 9

x= 10

The difference between 10and9 is 1 and twice 1 is 2.

The number is correct.

= 2x - 9