Answer:
x = - 3 ± 
Step-by-step explanation:
x² + 6x + 7 = 0 ( subtract 7 from both sides )
x² + 6x = - 7
using the method of completing the square
add ( half the coefficient of the x- term )² to both sides
x² + 2(3)x + 9 = - 7 + 9
(x + 3)² = 2 ( take square root of both sides )
x + 3 = ±  ( subtract 3 from both sides )
 ( subtract 3 from both sides )
x = - 3 ± 
 
        
             
        
        
        
Answer: you square root it. 
5r^2/5 = 80/5 =16
Sqr root of r^2=Sqr root of 16 
r=4
Step-by-step explanation:
 
        
             
        
        
        
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