Question

what is the factor of 1-81xpower4​

Answer 1

1 - 81x⁴

= (1)² - (9x²)²

= (1-9x²)(1+9x²)

= [(1)²-(3x)²][1+9x²]

= (1-3x)(1+3x)(1+9x²)

So, the factors of 1-81x⁴ are (1-3x), (1+3x) and (1+9x²).