extraneous root is a solution o an equation that seems to be  right but when we check it (by substituting it into the original equation) it turns out not to be right
 
        
             
        
        
        
The answer for f(x)-g(x) is  .The solution can be obtained by use of concept of functions.
.The solution can be obtained by use of concept of functions.
<h3>What is a function?</h3>
A function, in mathematics, can be defined as an expression, rule, or law that defines a relationship between one variable (the independent variable) and another variable (the dependent variable).It useful in mathematical representation of scientific quantities.
We can perform addition and subtraction operations on functions.
The given function f(x) and g(x) are

The solution for f(x)-g(x) is  .
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To know more about functions visit:
brainly.com/question/12431044
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18.853 I hope I helped, please give me brainliest!!!!
        
                    
             
        
        
        
I'm not sure if this is the answer you are looking for, but the number before a variable is called a coefficient.