This expression is equivalent (9+3)4
        
             
        
        
        
Answer: 4a2-20ab+12b2+4a+4
the 2 is squareing 4a and 12b
Step-by-step explanation:
expand move the parentheses
multiply the parentheses 
collect like terms
 
        
                    
             
        
        
        
Answer:
B. False
Step-by-step explanation:
According to pythagorean theorem, for this to be a right triangle, the sum of  square of the length of the two legs must equal square of the length of the hypotenuse (longest side). 
So   should equal
  should equal  
- <em>We also know that   </em> </em>
Hence,   , and
  , and 
 
 
They ARE NOT EQUAL, so the triangle is NOT a right triangle.
 
        
                    
             
        
        
        
Answer:
5x-4y+4
Step-by-step explanation:
3x-4y-2+2x+6
Gathers like terms together:
3x+2x= 5x
-4y= -4y
-2+6= 4
Put it together:
5x-4y+4