How do you define a variable and write an expression for each phrase: the total of four times a number and twice the difference between the number and four?

1 Answer
Mar 25, 2018

Answer:

first phrase: #4x#
seconds phrase: #2(x-4)#

Explanation:

Let us define the variable 'the number' as #x#.
#x# can be any number, which is why it is called a variable.

The first phrase, 'four times a number', is expressed as #4x#. Literally, #4*x#, or four times #x#.

The second phrase is harder, 'the difference between the number and 4' is simply our number subtract 4: #x-4#, but this is doubled, which becomes #2(x-4)#

Hope this helps!