因式分解：（1）（3a-2b)^2-(2a+3b)^2 (2)a^2-3a-10

xiexie

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（简袜陪拦蠢1）好戚（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)

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当a=3，b=4时，a^2+b^2+2ab=（a+b）^2=49．

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(3a-2b)^2-(2a+3b)^2
=(3a-2b+2a+3b)(3a-2b-2a-3b)
=(5a+b)(a-5b)

a^2-3a-10
=(a-5)(a+2)

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