(X+5)(x+y)
Factor x2 +5y+5x 
Cannot be factored
        
             
        
        
        
Lna^b = blna
let y = lne^e
so y = lne^e = e lne  
lne =  1 
y = e which is a constant (Euler's number) ~= 2.718 
For Euler's number estimating methods request in a comment. 
        
                    
             
        
        
        
Answer:
b = 1.778279, −1.778279
Step-by-step explanation:
 
        
                    
             
        
        
        
The answer is 10 because divide 20 and 2 and you get 10
        
                    
             
        
        
        
<span>use De Moivre's Theorem: 
⁵√[243(cos 260° + i sin 260°)] = [243(cos 260° + i sin 260°)]^(1/5) 
= 243^(1/5) (cos (260 / 5)° + i sin (260 / 5)°) 
= 3 (cos 52° + i sin 52°) 
z1 = 3 (cos 52° + i sin 52°) ←← so that's the first root 
there are 5 roots so the angle between each root is 360/5 = 72° 
then the other four roots are: 
z2 = 3 (cos (52 + 72)° + i sin (52+ 72)°) = 3 (cos 124° + i sin 124°) 
z3 = 3 (cos (124 + 72)° + i sin (124 + 72)°) = 3 (cos 196° + i sin 196°) 
z4 = 3 (cos (196 + 72)² + i sin (196 + 72)°) = 3 (cos 268° + i sin 268°) 
z5 = 3 (cos (268 + 72)° + i sin (268 + 72)°) = 3 (cos 340° + i sin 340°) </span>