adjusting format again

lectures/14_operators/README.md

@@ -6,8 +6,8 @@
 
 - Complex numbers take the form z = a + bi, where i = √−1 and a and b are real. a is called the real part, b is called the imaginary part.
 - If w = c + di, then  
-  – w + z = (a + c) + (b + d)i, 
-  – w − z = (a − c) + (b − d)i, and 
+  – w + z = (a + c) + (b + d)i,  
+  – w − z = (a − c) + (b − d)i, and  
   – w × z = (ac − bd) + (ad + bc)i 
 - The magnitude of a complex number is &radic;a<sup>2</sup> + b<sup>2</sup>;