(3a-4b)(7a-8b)+(11a+2b)(8b-7a)

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(3a-4b)(7a-8b)+(11a+2b)(8b-7a)

=(3a-4b)(7a-8b)-(11a+2b)(7a-8b)
=(7a-8b)(3a-4b-11a-2b)
=(7a-8b)(-8a-6b)
=-2(7a-8b)(4a+3b)

(3a-4b)(7a-8b)+(11a+2b)(8b-7a)
=(3a-4b)(7a-8b)-(11a+2b)(7a-8b)
=(7a-8b)[(3a-4b)-(11a+2b)]
=(7a-8b)(-8a-6b)
=-2(7a-8b)(4a+3b)
=-2(28a^2-53ab+48b^2)
=-56a^2+106ab-96b^2

(3a-4b)(7a-8b)+(11a+2b)(8b-7a)
=(3a-4b)(7a-8b)-(11a+2b)(7a-8b)
=(7a-8b)[(3a-4b)-(11a+2b)]
=(7a-8b)(-8a-6b)
=-2(7a-8b)(4a+3b)