Find All Real Solutions To $x^{4} - 10 x^{2} + 9 = 0$ $x^4-10x^2+9=0$ . Help, Plz?

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Answer 1 · 2018-01-14T21:34:35

-1, 1, -3, 3

Use the fact that $X^{2} - 10 X + 9 = (X - 1) (X - 9)$ $X^2 - 10 X + 9 = (X-1)(X-9)$ . Apply that with $X = x^{2}$ $X=x^2$ .

Find All Real Solutions To x4−10x2+9=0x^4-10x^2+9=0. Help, Plz?