- #1

- 699

- 5

x^4 + 7x^2 + 6 =0

I know the answers are imaginary but I don't remember how to solve this equation.

I know the answers are imaginary but I don't remember how to solve this equation.

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- Thread starter Dustinsfl
- Start date

- #1

- 699

- 5

x^4 + 7x^2 + 6 =0

I know the answers are imaginary but I don't remember how to solve this equation.

I know the answers are imaginary but I don't remember how to solve this equation.

- #2

- 105

- 0

Let t=x^2 and solve for t. Then once you have t, you can easily find x.

- #3

- 699

- 5

If I do that and solve for t, I obtain two real solutions when all 4 all imaginary.

- #4

- 105

- 0

[tex] x^2=\frac{-7\pm \sqrt{49-24}}{2}[/tex]

[tex] x^2=\{-6,-1\} [/tex]

both values of x^2 for negative, so all 4 values of x are imaginary. Check your working?

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