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प्रश्न
Solve:
x4 – 10x2 + 9 = 0
उत्तर
x4 – 10x2 + 9 = 0
`=>` x4 – 9x2 – x2 + 9 = 0
`=>` x2(x2 – 9) – 1(x2 – 9) = 0
`=>` (x2 – 9)(x2 – 1) = 0
If x2 – 9 = 0 or x2 – 1 = 0
`=>` x2 = 9 or x2 = 1
`=>` x = ±3 or x = ±1
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