(3a-2b)²-(3a+2b)²=(3a-2b+3a+2b)(3a-2b-3a-2b)=6a(-4b)= -24ab
(3a-2b)²-(3a+2b)²=(3a-2b+3a+2b)(3a-2b-3a-2b)=6a(-4b)=-24ab