Question

Factorise -          P^4-81  please fast

​

Answer 1

Step-by-step explanation:

Step-by-step explanation:

P^4 can be written as (P^2)^4 and 81 as (3^2)^2

By the formula,

(a^2 - b^2) = (a+b) (a-b)

So,

(p^2 )^2 - (3^2)^2 = (p^2 - 3^2) (p^2 + 3^2)

= (p^2 - 9)(p^2 + 9)

Hope it helps you!

Answer 2

Answer:

(p+3)(p-3)(p²+9)

Step-by-step explanation:

p⁴-81=(p²)²-(9²) (by a²-b²)

        =(p²-9)(p²+9)

        =(p²+9)(p-3)(p+3)