2b^2. This is because you have a positive a^2 and a negative so they cross it one another so it just leaves the b’s.
        
                    
             
        
        
        
Answer: The answer is 40 minutes. 
Equation: If m is the total number of minutes it takes him to complete his homework, 30% of m is given by 0.3m. Since 30% was done in 12 minutes, we have 0.3m=12.
 
        
             
        
        
        
The first option is correct here: 
<h3>Given the 
polynomial:</h3>

<h3 /><h3>Simplification:</h3>
Combine the like terms together as shown below:

Thus, the first option is correct here: 
For more information, refer to:
brainly.com/question/10689855