分解因式4x^4-13X^2+9怎么解,
问题描述:
分解因式4x^4-13X^2+9怎么解,
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)