Answer: delete this please
 
        
                    
             
        
        
        
<u>Answer-</u>
<em>The lines are two </em><em>coinciding lines</em><em> or the </em><em>same lines</em><em>.</em>
<u>Solution-</u>
The given line equations are 
the first one,
  
the second one,
 
As we know two line equations 
 and 
 will be,
- Parallel if, 

 - Coincide if, 

 - Intersect if, 

 
As here, 


(C₁ and C₂ aren't considered as they are 0)
Therefore, the lines are two coinciding lines or the same lines.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
7). (x + 3)(x + 7)
   = x(x + 7) + 3(x + 7)
   = x² + 7x + 3x + 21
   = x² + 10x + 21
8). (4x + 2)(x - 2)
   = 4x(x - 2) + 2(x - 2)
   = 4x² - 8x + 2x - 4
   = 4x² - 6x - 4
9). (3x + 2)(2x + 5) 
   = 3x(2x + 5) + 2(2x + 5)
   = 6x² + 15x + 4x + 10
   = 6x² + 19x + 10
10). (x² - 6)(x - 4)
   = x²(x - 4) - 6(x - 4)
   = x³ - 4x² - 6x + 24
11). (x² + 9)(x - 3)
   = x²(x - 3) + 9(x - 3)
   = x³ - 3x² + 9x - 27
12). (4x²- 4)(2x + 1)
   = 4x²(2x + 1) - 4(2x + 1)
   = 8x³ + 4x² - 8x - 4