SOLUTION: X to the power of 3 or cubed + 216 = 0 ::::: we factor out (x+6) and are left with (x squared -6x + 36) ::: we know the answer is 3 plus or minus 3(times square root of 3i) but

Question 218953: X to the power of 3 or cubed + 216 = 0 ::::: we factor out (x+6) and are left with (x squared -6x + 36) ::: we know the answer is 3 plus or minus 3(times square root of 3i) but can't get there :::
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
X to the power of 3 or cubed + 216 = 0 ::::: we factor out (x+6) and are left with (x squared -6x + 36) ::: we know the answer is 3 plus or minus 3(times square root of 3i) but can't get there :::
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x = -6
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Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc)

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

The discriminant -108 is less than zero. That means that there are no solutions among real numbers.

If you are a student of advanced school algebra and are aware about imaginary numbers, read on.

In the field of imaginary numbers, the square root of -108 is + or - .

The solution is , or
Here's your graph:

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