Answer:
2/7
Step-by-step explanation:
-1 1/7 + 6/7 = -8/7 + 6/7 = 2/7
 
        
                    
             
        
        
        
Answer:
1/2 , .5 , 50%
Step-by-step explanation:
 
        
             
        
        
        
Answer:
 Solutions are 2,  -1 +  0.5 sqrt10 i  and -1 - 0.5 sqrt10 i
or 2,  -1 +  1.58 i  and -1 - 1.58i
(where the last 2 are equal to nearest hundredth).
Step-by-step explanation:
The real solution is x = 2:-
x^3 - 8 = 0
x^3 = 8
x = cube root of 8 = 2
Note that a cubic equation must have  a total of 3 roots ( real and complex in this case).  We can find the 2 complex roots by using the following identity:-
a^3 - b^3 = (a - b)(a^2 + ab + b^2).
Here  a = x and b = 2 so we have
(x - 2)(x^2 + 2x + 4) = 0 
To find the complex roots we solve x^2 + 2x + 4 = 0:-
Using the quadratic formula x = [-2 +/- sqrt(2^2 - 4*1*4)] / 2
= -1 +/- (sqrt( -10)) / 2
= -1 +  0.5 sqrt10 i  and -1 - 0.5 sqrt10 i