(3a-4b)²-(3a＋b)(3a-b)=------------

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(3a-4b)²-(3a＋b)(3a-b)=------------
(3a-4b)²-(3a＋b)(3a-b)=------------

(3a-4b)²-(3a＋b)(3a-b)=------------
=(3a-4b)²-(3a-b)²=(3a-4b+3a-b)(3a-4b-3a+b)=(6a-5b)(-3b)=-18ab+15b²

(3a-4b)²-(3a＋b)(3a-b)
=9a^2+16b^2-24ab-9a^2+b^2
=17b^2-24ab