SOLUTION: find the real number solutions of the equation. y^4-14y^2+45

Question 175737: find the real number solutions of the equation.
y^4-14y^2+45
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Your first problem is that you don't actually have an equation. There is not an equal sign to be seen anywhere in . So all I can do is assume that you meant . Presuming this is the case, let

Then you can write: which is a quadratic that can be solved by ordinary means; this one factors because and , so:

Therefore, or which is to say:

or

But remember that , so we can now say:

which means that or , and

which means that or

And there are your four real number roots.

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