Define the operation $\star$ as $K\star L = (K+L)(K-L)$ for all integers $K$ and $L$. What is the value of $6\star5$?
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Define the operation $\star$ as $K\star L = (K+L)(K-L)$ for all integers $K$ and $L$. What is the value of $6\star5$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
11
Define the operation $\star$ as $K\star L = (K+L)(K-L)$ for all integers $K$ and $L$. What is the value of $6\star5$?
train