Factorization problem 3x ^ 4 + 6x ^ 2-9
3x^4+6x^2-9
=3(x^4+2x²-3)
=3(x²-1)(x²+3)
=3(x-1)(x+1)(x²+3)
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- 4. What is the solution of X & # 178; - 3x + 18 = 0,
- 5. It is known that the set a = {x | X & # 178; + 3x-18 > 0}, B = {x | X & # 178; - (2k + 1) x + K (K + 1) ≤ 0, And a ∩ B ≠ &;, then the value range of real number k is——
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