SOLUTION: Hi I am having trouble solving the following problem: x^3-8=0 Can you provide some help in solving this - there are three answers one of which is 2 but I cannot figure out the

Question 8979: Hi
I am having trouble solving the following problem:
x^3-8=0
Can you provide some help in solving this - there are three answers one of which is 2 but I cannot figure out the other two imaginary ones.
Thanks
Lee
Found 2 solutions by longjonsilver, rapaljer:
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
there should be an identity to factorise ... you have .

I just cannot lay my hands on it at the moment...that will give you (x-2) and a quadratic bracket...solve that to give you your 2 imaginary answers

jon.

Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Factors into

The quadratic factor can be solved by either the quadratic formula, the pluggable solver, or by completing the square. Completing the square is fairly easy:

, and of course, x=2!!

R^2
RELATED QUESTIONS
Hi, I am having trouble solving this inequality: 2x≤5-7x<7+x The answer my... (answered by stanbon)
hi, can you please help me on solving systems using substation this is a problem I am... (answered by amarjeeth123)
Hello. I am having trouble solving the following polynomial inequality. {{{... (answered by chibisan)
I'm having trouble solving this problem for some reason. I am not understanding how to... (answered by mananth)
Solve and graph the solution set. 3(x � 4) > 7x � 9 I am having trouble solving... (answered by stanbon)
I am having trouble solving the following problem. Please help. seven thirds x = two... (answered by wuwei96815)
Hi I'm having some trouble with this problem, we have to divide this algebraic... (answered by stanbon)
Factor Completely. x^2 - 2x +1 I am having trouble solving this problem and need some... (answered by jim_thompson5910)
I am having trouble solving the equation: 9/b-8/b=1/4. Can you... (answered by Alan3354)