因式分解:(1)(3a-2b)^2-(2a+3b)^2 (2)a^2-3a-10xiexie
问题描述:
因式分解:(1)(3a-2b)^2-(2a+3b)^2 (2)a^2-3a-10
xiexie
答
当a=3,b=4时,a^2+b^2+2ab=(a+b)^2=49.
答
(1)(3a-2b)^2-(2a+3b)^2
=(3a-2b+2a+3b)(3a-2b-2a-3b)
=(5a+b)(a-5b)
(2)a^2-3a-10
=(a-5)(a+2)