Why couldn't this be factored further?

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Homework Help Overview

The discussion revolves around factoring the expression s^4 - 625, which is identified as a difference of two squares. The original poster seeks clarification on the limitations of factoring, particularly regarding the term s^2 + 25.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the factorization of the expression, noting the successful application of the difference of squares formula. Questions arise regarding the possibility of further factoring the term s^2 + 25, with some participants pointing out the distinction between sums and differences of squares.

Discussion Status

The discussion is active, with participants providing insights into the limitations of factoring sums of squares. Some guidance has been offered regarding the nature of the expression and its factorization under real numbers versus complex numbers.

Contextual Notes

There is an emphasis on the assumption that variables represent whole numbers, which influences the discussion about the factorization of sums of squares.

Peter Tran
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Homework Statement



Factor the following difference of two squares. Assume that variables represent whole numbers.

s^4 - 625

Homework Equations



(A)^2 - (B)^2

The Attempt at a Solution



s^4-625
(s^2)^2 - 25^2
(s^2+25)(s^2-25)
(s^2+25)(s+5)(s+5) - Correct

The "program" wants me to stop there, but why? Couldn't I just go ahead and continue factoring the (s^2+25) also?
 
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You can't factor a2+b2. You were able to factor difference of two squares only, not sum of two squares.

p.s. I think you made a typo, it should be (s2+25)(s+5)(s-5)
 
Peter Tran said:

Homework Statement



Factor the following difference of two squares. Assume that variables represent whole numbers.

s^4 - 625

Homework Equations



(A)^2 - (B)^2

The Attempt at a Solution



s^4-625
(s^2)^2 - 25^2
(s^2+25)(s^2-25)
(s^2+25)(s+5)(s+5) - Correct

The "program" wants me to stop there, but why? Couldn't I just go ahead and continue factoring the (s^2+25) also?

No. There is no way to factor s2 + 25 (or any sum of two squares in the form a2 + b2) under the real numbers. However, if you are familiar with complex numbers, then s2 + 25 could be factored further, but I don't know if you need to do that.
 
Oh that's right, I completley forgot that I could only factor A2 - B2.
Thanks.
 

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