(1)a的三次方+a的平方-12 (2)x的四次方-11x+1因式分解
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(1)a的三次方+a的平方-12 (2)x的四次方-11x+1因式分解
(1)a的三次方+a的平方-12 (2)x的四次方-11x+1因式分解
(1)a的三次方+a的平方-12 (2)x的四次方-11x+1因式分解
⑴a^3+a^2-12
=a^3-2a^2+3a^2-12
=a^2(a-2)+3(a^2-4)
=a^2(a-2)+3(a+2)(a-2)
=(a-2)(a^2+3a+6)
⑵x^4-11x+1这题是不是抄错了题目?改成x^4-11x^2+1倒还可以做:
x^4-11x^2+1
=x^4-2x^2+1-9x^2
=(x^2-1)^2-(3x)^2
=(x^2+3x-1)(x^2-3x-1)