(7abc+b2)(-7bc)+c(2b3-9ab)
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(7abc + b²)(-7bc) + c(2b³ - 9ab)
=> (-49ab²c² - 7b³c) + (2b³c - 9abc)
Open all the brackets
=> -49ab²c² - 7b³c + 2b³c - 9abc
=> -49ab²c² - 5b³c - 9abc
Hope this helps.
(7abc + b²)(-7bc) + c(2b³ - 9ab)
=> (-49ab²c² - 7b³c) + (2b³c - 9abc)
Open all the brackets
=> -49ab²c² - 7b³c + 2b³c - 9abc
=> -49ab²c² - 5b³c - 9abc
Hope this helps.
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