Question

a4-b4=?????????????????????

Answer 1

Hi ,

( a⁴ + b⁴ ) = ( a² + b² )² - 2a²b²

Or 

( a⁴ + b⁴ ) = ( a² - b² )² + 2a²b²

I hope this helps you.

:)

Answer 2

a4-b4=(a²)²-(b²)²=[(a²-b²)(a²+b²)]=[(a+b)(a-b)(a²+b²)]