问题
填空题
分解因式:a4-9-6b-b2=______.
答案
a4-9-6b-b2
=a4-(b2+6b+9)
=a4-(b+3)2
=(a2-b-3)(a2+b+3).
故答案为:(a2-b-3)(a2+b+3).
分解因式:a4-9-6b-b2=______.
a4-9-6b-b2
=a4-(b2+6b+9)
=a4-(b+3)2
=(a2-b-3)(a2+b+3).
故答案为:(a2-b-3)(a2+b+3).