Question

solve using appropriate identity
x⁴-81​

Answer 1

==>(x²)² - (3²)²

==> (x²+3²)(x²-3²)

==> (x²+3²) [(x-3) (x+3)]

hope it helps you friend!

Answer 2

Step-by-step explanation:

By the formula a²-b² = (a+b) (a-b)

x⁴-81 = (x²+9)(x²-9)

= (x²+9)(x+3)(x-3)