
Carol H. answered 09/29/14
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Experienced Mathematics Tutor w/ Master's Degree in Math
3(a+d)2[(a+d)-5-6(a+d)2] =
3(a+d)2[a+d-5-6(a2+2ad+d2)]=
3(a+d)2(a+d-5-6a2-6ad-6d2)
So, the GCF is 3(a+d)2
I'm not sure how much you want it simplified. You could expand (a+d)2