Question

simplify the following using a²-b²=(a-b)(a+b)
81a²-49b²​

Answer 1

Step-by-step explanation:

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

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