x^6-4x^4-9x^2+36
=x^4(x^2-4)-9(x^2-4)
=(x^2-4)(x^4-9)
=(x+2)(x-2)(x^2+3)(x^2-3)
=(x+2)(x-2)(x^2+3)(x-√3)(x+√3)
分解因式x^6-4x^4-9x^2+36
x^6-4x^4-9x^2+36
=x^4(x^2-4)-9(x^2-4)
=(x^2-4)(x^4-9)
=(x+2)(x-2)(x^2+3)(x^2-3)
=(x+2)(x-2)(x^2+3)(x-√3)(x+√3)