How do you factor completely $x^4-24x^2-25$ ?

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Answer 1 · 2016-04-16T21:20:37

$x^4-24x^2-25=(x-5)(x+5)(x^2+1)$

$x^4-24x^2-25=(x^2-25)(x^2+1)$
$(x^2-25)=(x^2-5^2)=(x-5)(x+5)$
$x^4-24x^2-25=(x-5)(x+5)(x^2+1)$

How do you factor completely x^4-24x^2-25x^4-24x^2-25?