Question

use identities to factorise each of the following​

Answer 1

Step-by-step explanation:

Here is your answer

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Using (a^2-b^2)=(a+b) (a-b) identity

Answer 2

Answer:

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

$\: \: \: \: \: 25 {x}^{2} - 81 {y}^{2} \\ = {(5x)}^{2} - {(9y)}^{2} \\ = (5x + 9y)(5x - 9y)$