Answer: The correct option is
(C) 9x.
Step-by-step explanation: We are given to simplify the following expression :
[tex]E=(7x)-(-2x)~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
We will be using the following rule in simplifying the given expression :
[tex]a-(-b)=a+b.[/tex]
From expression (i), we get
[tex]E\\\\=(7x)-(-2x)\\\\=7x+2x\\\\=(7+2)x\\\\=9x.[/tex]
Thus, the required simplified form is 9x.
Option (C) is CORRECT.
