[中學] 奧數的因式分解
有幾題我想了很久還是想不出為什麼?
1.x^4 +5x^3 +15x -9 =??
答案 (x^2 + 3)(x^2 +5x -3)
2.x^5 +x +1 =??
答案 (x^3 -x^2 +1)(x^2 +x +1)
3.-x^4 +3x^2 -1 =??
答案 -(x^2 +x -1)(x^2 -x -1)
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