Question

(7a-9b)(7a+9b) please send me the answer ​

Answer 1

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$\mathbb{(7a-9b) (7a+9b)}$

$\mathbb{(7a)^2 - (9b)^2}$

$\mathbb{49a^2 - 81b^2}$

Identity Used:

$\mathbb{a^2-b^2= (a+b) (a-b)}$

Hope it helps úh

Answer 2

Step-by-step explanation:

$\implies \: (7a - 9b)(7a + 9b) \\ \\ \implies \: {(7a)}^{2} - {(9b)}^{2} \\ \\ \implies \: 49{a}^{2} - 81 {b}^{2}$

We know that ,

$(a + b)(a - b) = {a}^{2} - {b}^{2}$