Why cant 81-x to the forth power be factored unti (3+x) squared times (3-x) squared

Below.

Step-by-step explanation:

81 - x^4        Treat as the difference of 2 squares:

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

We can further factor the 9 - x^2   (difference of 2 squares)

= (3 - x)(3 + x)(9 + x^2).

9 + x^2 can't be factored.

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step-by-step explanation:

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.