Sum
Solve x4 – 10x2 +9 =0
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Solution
x4 – 10x2 +9 =0
`=> x^4 - 9x^2 - x^2 + 9 = 0`
`=> x^2(x^2 - 9) - 1(x^2 - 9) = 0`
`=> (x^2 - 9)(x^2 - 1) = 0`
If `x^2 - 9 = 0` or `x^2 - 1 = 0`
`=> x^2 =9` or `x^2 = 1`
`=>x = +- 3 or x = +-1`
Concept: Quadratic Equations
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