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Smb00l ∙
Use the FOIL method.
(4x^3 - 4)(x^2-25)
4x^3*x^2=4x^5
-4*x^2=-4x^2
4x^3*-25=-100x^3
-4*-25=100
4x^5-100x^3-4x^2+100
Factor out a 4 to simplify
4(x^5-25x^3-x^2+25)
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