Check my math...?

Yes i know this script is a mess but it's my first time trying mesh generation via code. The code returns no error so it has to be a math error

Here is the line that contains the math i wasn't sure how to contain the order of operations so this is how i typed it and it returns (0, 0, 0) when it is suppose to be (-5, -0, 5)

 float maxRoomSize = 100;
 
 vertices [1] = new Vector3 (-1 * 1 / 2 * Mathf.Sqrt (maxRoomSize), 0, 1 / 2 * Mathf.Sqrt (maxRoomSize));
 
 //Square root of 100 is 10
 
 //10 * 1/2 = 5
 
 //5 * -1 = -5 why is it 0?

I'm almost positive its an order of operations error but i'll let someone else judge that