Answer:
<h2>The radius is 4 units long.</h2>
Step-by-step explanation:
The given equation is

This equation belongs to a circle, which center is at (0.5, 3.5) and its radius is 4.
You can deduct its elements, becase this equation of the circle is explicit, which means the constant term represents the square power of the radius. Solving that, we have

Therefore, the radius is 4 units long.
 
        
             
        
        
        
Answer: 1.5s+20
Step-by-step explanation:
 
        
             
        
        
        
The answer is 2x(2x²+x+1).
When we subtract polynomials we combine like terms:
(9x³+2x²-5x+4)-(5x³-7x+4)
9x³-5x³=4x³
2x²- 0 = 2x²
-5x--7x=-5x+7x=2x
4-4=0
This gives us 
4x³+2x²+2x
Each of these is divisible by 2, and each has an x, so we factor those out:
2x(                        )
4x³/2x = 2x²:
2x(2x²                   )
2x²/2x=x:
2x(2x²+x               )
2x/2x = 1:
2x(2x²+x+1)