A coefficient is the number directly in front of the variable, aka the number being multiplied with the variable. In this case it's -3.
        
                    
             
        
        
        
Could you explain a bit more please 
 
        
                    
             
        
        
        
Answer: 7^5 or 7 to the fifth power.
Step-by-step explanation: This is an exponent meaning you count the 7’s and in the first picture there’s 5 7’s. This means that the number your putting to a power is the yellow box so that’s 7 and the exponent is 5 not 4 because if you did 7 to the first power it’s still 7 so it would be 7 to the 5th power or 7^5 
 
        
             
        
        
        
Answer:

Step-by-step explanation:
1) In this question we've been given "a", the leading coefficient. and two roots:

2) There's a theorem, called the Irrational Theorem Root that states:
If one root is in this form  then its conjugate
  then its conjugate  . is also a root of this polynomial.
. is also a root of this polynomial.
Therefore 

3) So, applying this Theorem we can rewrite the equation, by factoring. Remembering that x is the root. Since the question wants it in this expanded form then:

 
        
                    
             
        
        
        
Im thinking it's false. 18 isn't even between 4 and 9.