Answer:
21 is a composite number
Step-by-step explanation:
It is a composite because multiple numbers can go in it like 3 and 7 so it is a composite number
The differnce of 2 perfect cubes
remember
a³-b³=(a-b)(a²+ab+b²)
so
....... argue 6e73t83hwp260wcsihwoec
Vertex is (-2,-3) and it's a minimum.