Question

$x^{4}-13x^{2} + 36$
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Answer 1

x^4-13x^2+46
x^4-4x^2-9x^2+36
x^2•(x^2-4)-9•(x^2-4)
(x^2-4)•(x^2-9)
(x-2)•(x+2)•(x-3)•(x+3)