The simplified expression is  and the restriction is
and the restriction is 
<h3>How to simplify the expression?</h3>
The expression is given as:

Express x^2 - y^2 as (x + y)(x - y) and factorize other expressions

Rewrite the expression as products

Cancel out the common factors

Express 4x^2 - y^2 as (2x - y)(2x + y)

Cancel out the common factors

Take the LCM

Hence, the simplified expression is  and the restriction is
and the restriction is 
Read more about expressions at:
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One number is 4
Another is 2 I hope this helped
        
                    
             
        
        
        
he divided each rectangle in 12 identical parts
for the first rectangle he shaded 1/3 of 12 = 4 parts 
for the second rectangle he shaded 1/4 of 12= 3 parts
so 12= 3*4 leads to a minimum of 12 parts 
:) 
 
        
             
        
        
        
No idea sorry! If I knew I would tell you