Question

Factorise
Зx³у-243 ху³​

Answer 1

Step-by-step explanation:

$take \: 3xy \: as \: common \\ therefore \\ 3xy( {x}^{2} - 81 {y}^{2} ) \\ using \: identity \: ( {a}^{2} - {b}^{2} ) = (a + b)(a - b) \\ 3xy (x + 9y)(x - 9y)$

And here is your required factorisation..