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How do you factor x^4+2x^2-8=0 ? all steps please and thanks!

Quote: Originally Posted by hypermonkee How do you factor x^4+2x^2-8=0 ? all steps please and thanks! let $\displaystyle a = x^2$, then you have $\displaystyle a^2 + 2a - 8 = 0$ think you can take it from here?