Question

Expand the following (3a+7b+c)^2​

Answer 1

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Answer 2

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$= {(3a + 7b + c)}^{2} . \\ \\ = {(3a)}^{2} + {(7b)}^{2} + {(c)}^{2} + 2(3a \times 7b + 7b \times c + c \times 3a). \\ \\ = {9a}^{2} + {49a}^{2} + {c}^{2} + 2(21ab + 7bc + 3ac)$

Formula :-

${(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ca).$

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