Hi my name is Julio.
Level: Secondary
Who is asking the question: Student

How can I factor the following?:

3x⁴ - 81


Thanks for your response.

Julio,

First take out the common factor of 3.

3x⁴ - 81 = 3(x³ - 27)

Can you see what to do now? A clue is that 27 = 3³.

Penny