Question 6598: Dear Sir/Madam,
I am confronted with the following problem:
"Solve for x. Find all solutions. x^3 + 2x^2 + 5x = 0"
I did the following:
1) x(x^2 + 2x + 5 = 0)
2) x = 0
3) x^2 + 2x + 5 = 0
So I assumed that the only answer is x = 0, however the answer is x = 0, -1+-2i. What is meant by 2i? Does i stand for imaginary number? And how do you get that answer?
Thanks in advance.
-Mike Found 2 solutions by ichudov, z3311638:Answer by ichudov(499) (Show Source):
You can put this solution on YOUR website! Great job, both in solving the problem as well as in using my formula system.
your step 5 is wrong, the answer is , (you forgot /2)or
You should re-read the complex numbers chapter, where they explain what i is (i can be thought of as sqrt(-1).