Answer:
x^2 -2x = 4x+1
2x^2 +12x = 0
9x^2 +6x -3=0 
Step-by-step explanation:
A quadratic equation has the highest power of x being squared
x^2 -2x = 4x+1
2x^2 +12x = 0
9x^2 +6x -3=0 
These are all quadratic equations
 
        
                    
             
        
        
        
Answer: 2< x < 10, closed circle at 2 and 10, line inbetween them
Step-by-step explanation:
 
        
             
        
        
        
Answer:
what is this 
Step-by-step explanation: