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Question
Solve:
x4 – 2x2 – 3 = 0
Sum
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Solution
x4 – 2x2 – 3 = 0
`=>` x4 – 3x2 + x2 – 3 = 0
`=>` x2(x2 – 3) + 1(x2 – 3) = 0
`=>` (x2 – 3)(x2 + 1) = 0
If x2 – 3 = 0 or x2 + 1 = 0
`=>` x2 = 3 or x2 = –1 ...(Reject)
`=> x = +-sqrt3`
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