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3道因式分解速求答案需要过程~(1)x^3+3x^2-4(2)(x+y)^2+4(x-y)^2-4(x^2-y^2)(3)x^4-2X^2+5x-4

题目详情
3道因式分解速求答案
需要过程~
(1)x^3+3x^2-4
(2)(x+y)^2+4(x-y)^2-4(x^2-y^2)
(3)x^4-2X^2+5x-4
▼优质解答
答案和解析
(1)x^3+3x^2-4
=x^3+2x^2+x^2-4
=x^2(x+2)+(x-2)(x+2)
=(x^2+x-2)(x+2)
=(x-1)(x+2)^2
(2)(x+y)^2+4(x-y)^2-4(x^2-y^2)
=(x+y)^2+^2-4(x-y) (x+y)
=^2
=(3x-y)^2
(3)x^4-2X^2+5x-4
=x^4-X^2-x^2+5x-4
=x^2(X^2-1)-(x-1)(x-4)
=x^2(X-1)(x+1)-(x-1)(x-4)
=(x-1)(x^3+x^2-x+4)