Question

Factorise each of the following: 3x³y – 243xy³ using identites​

Answer 1

Answer:

Step-by-step explanation:

3xy[x²-y²]

3xy(x-y)(x+y)

Answer 2

$3 {x}^{3} y - 243x {y}^{3}$

$= 3xy( {x}^{2} - 81 {y}^{2} )$

$= 3xy( {(x)}^{2} - {(9y)}^{2} )$

$= 3xy(x + 9y)(x - 9y)$