Question

Find the product using suitable identity. (За + 7b) (3а - 7b)​

Answer 1

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(За + 7b) (3а - 7b)= (3a+7b)^2

Answer 2

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$\bf Identity \: to \: be \: used: \\ \sf (a + b)(a - b) = {a}^{2} - {b}^{2} \\ \sf \therefore (3a + 7b)(3a - 7b) = {(3a)}^{2} - {(7b)}^{2} \\ \sf = {9a}^{2} - {49b}^{2}$

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