因式分解:4x^4-13x^2+9
问题描述:
因式分解:4x^4-13x^2+9
答
4x^4-13X^2+9
=(4x^4-4x^2)-(9x^2-9)
=4x^2(x^2-1)-9(x^2-1)
=(x^2-1)(4x^2-9)
=(x+1)(x-1)(2x+3)(2x-3)