Question

81a²-9b²
factorisation​

Answer 1

Answer:

$81 {a}^{2} - 9 {b}^{2} \\ = {(9a)}^{2} - {(3b)}^{2} \\ =( 9a + 3b)(9a - 3b)$

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Answer 2

Answer:

(9a+3b) (9a-3b)

Step-by-step explanation:

81a²-9b²

=(9a)²-(3b)²

=(9a+3b)(9a-3b)