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hi everyone can I ask a question please solve this problem (7a-b-c)+(2a-2b+c) please help me I can't understand this problem

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Ennaojviz
the answer is 14a(exponent 2)+2b(exponent2)-14b-2ab+5ac+2-c(exponent2)

80% Sure :)
AnneCviz
(7a)(2a) + (7a)(-2b) + (7a)(c) + (-b)(2a) + (-b)(-2b) + (-b)(c) + (-c)(2a) + (-c)(-2b) + (-c)(c)

⇓

14a² - 14ab + 7ac -2ab + 2b² - bc - 2ac + 2bc - c²

⇓

14a² + 2b² - c² - 16ab + 5ac +bc