4x^4 - 45 x^2 + 81 = 0
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8
4x^4 - 45x^2 + 81 = 0
4x^4 - 36x^2 - 9 x^2 + 81 = 0
4x^2 ( x^2 - 9) - 9(x^2 -9) = 0
Therefore,
(x^2 - 9)(4x^2 -9) = 0
x = +-3 or x = +-3/2
4x^4 - 36x^2 - 9 x^2 + 81 = 0
4x^2 ( x^2 - 9) - 9(x^2 -9) = 0
Therefore,
(x^2 - 9)(4x^2 -9) = 0
x = +-3 or x = +-3/2
Answered by
1
Answer:
4x^4 - 45x^2 + 81 = 0
4x^4 - 36x^2 - 9 x^2 + 81 = 0
4x^2 ( x^2 - 9) - 9(x^2 -9) = 0
Therefore,
(x^2 - 9)(4x^2 -9) = 0
x = +-3 or x = +-3/2
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