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64a²b² + 25c² - 80abc
= (8ab)² + (5c)² - 80 abc    using rule for a² + b² = (a + b)² - 2ab
= (8ab + 5c )² - 80abc - 80abc
=(8ab + 5c )² - 160abc     answer
1 5 1
any question ask and plz mark as best
(8ab-5c)(8ab-5c) it is the whole square of 8ab-5c
this is actually the correct answer i have worked it out
yeah right both are right you have to solve this according to the answer
actually this type of questions are profes