Question

13. Factorise
ii) 81x2 - 169y2​

Answer 1

Step-by-step explanation:

$81 {x}^{2} - 169 {y}^{2}$

$= {(9x)}^{2} - {(13y)}^{2}$

$= (9x + 13y)(9x - 13y)$

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