Question

what is 5c^4-3125 factored completely?

Answer 1

factor 3125 -> 5^5
so
5c^4-3125
=5c^4-5^5
=5(c^4-5^4)
=5(c^2+5^2)(c^2-5^2)
=5(c^2+5^2)(c+5)(c-5)

Answer 2

Factor 3125 -> 5^5
5c^4-3125
=5c^4-5^5
=5(c^4-5^4)
=5(c^2+5^2)(c^2-5^2)
=5(c^2+5^2)(c+5)(c-5)