Question

factorise the expression:3x³y-243xy³​

Answer 1

Answer:

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

Step-by-step explanation:

3x³y-243xy³

3xy(x² - 81y²)

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

Using formula

a² - b² = (a + b)(a - b)