Question

Prove that:

16^4-2^13-4^5 is divisible by 11

*Solve by factoring*

Answer format:
__*11

Answer 1

Explanation:

16⁴ - 2¹³ - 4⁵

= 2¹⁶ - 2¹³ - 2¹⁰

= 2¹⁰(2⁶ - 2³ - 1)

= 2¹⁰(64 - 8 - 1)

= 2¹⁰ * 55

= 2¹⁰ * 5 * 11.

Since it contains 11 in its prime factorization, it is divisible by 11. (Proven)