Isn’t it h?
extra words so i can actually post this reply
        
                    
             
        
        
        
The difference between (3x+6y)(3x+6y) and  (4x+9y)(4x+9y) is 7x² +36xy+45y²
<h3>What is an Expression ?</h3>
An expression is a mathematical statement which has variables , constants and mathematical operators  simultaneously.
The expression given in the question is
 (3x+6y)(3x+6y) and  (4x+9y)(4x+9y)
 the difference when (3x+6y)(3x+6y) is subtracted from (4x+9y)(4x+9y)
 (4x+9y)(4x+9y) -  (3x+6y)(3x+6y)
16 x² + 36xy+36xy +81y²-9x²-18x -18x -36y²
7x² +36xy+45y²
Therefore in simplest term , The difference between (3x+6y)(3x+6y) and  (4x+9y)(4x+9y) is 7x² +36xy+45y²
To know more about Expression
brainly.com/question/15245739
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Your answer is 15, if you need help to figure out how I did that let me know.
        
             
        
        
        
Answer:
The expression you are looking for is: 18+x
Step-by-step explanation: