因式定理,分解因式:x^4+2x^3y-3x^2y^2-4xy^3+4y^4
问题描述:
因式定理,分解因式:x^4+2x^3y-3x^2y^2-4xy^3+4y^4
答
原式=(x^4+2x^3y-3x^2y^2)-(4xy^3-4y^4)
=x^2(x^2+2xy-3y^2)-4y^3(x-y)
=x^2(x+3y)(x-y)-4y^3(x-y)
=(x^2-4y^3)(x+3y)(x-y)