Question

FACTORISE ,
81x^4-y^4

Answer 1

81x⁴-y⁴

= (9x²)²-(y²)²

= (9x²-y²) ( 9x²+y²)

= {( 3x)²-(y)²} ( 9x²+y²)

= (3x-y) (3x+y) (9x²+y²)

thanks

Answer 2

Answer:

Hey Mate..

Here is your answer...

1. 81x⁴-y⁴

= [(9x)²]² - [(y)²]²

= (9x²-y²)(9x²+y²)

= [(3x)²-(y)²](9x²+y²]

=(3x-y)(3x+y)(9x²+y²)

HOPE THIS WILL HELP YOU...

HAVE A GREAT DAY AHEAD..

THANK YOU:-)