Question

Factorise y⁴ - 81 with step by Step explanation​

Answer 1

Answer:y⁴=81

Then we have to use trial and error method

If y=1 then y⁴=1

If y=2 then y⁴=16

If y=3 then y⁴=81

Therefore y=3

Answer 2

Here is the answer I'm getting.