Answer: K = 0
Step-by-step explanation:
I'm pretty sure this is right or not.
Greetings!Simplify the Expression.
Distribute the Parenthesis.
How? Multiply the terms inside the Parenthesis by the term outside of the Parenthesis.
Combine Like Terms.

![\left[\begin{array}{ccc}8x^2-12x\end{array}\right]](https://tex.z-dn.net/?f=%20%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D8x%5E2-12x%5Cend%7Barray%7D%5Cright%5D%20)
Hope this helps.
-Benjamin
I can help! Do you have an example problem that I can show you step by step?