Question

How to calculate the determinant of a 2X2 matrix in Node.js

Answer 1

const arr = [ [ 3, 9 ], [ 4, 6 ]]
  
/*
 *       a b
 * arr = 
 *       c d
 * 
 * determinant = a*d - b*c
 * 
 */
      
const determinant = (arr[0][0] * arr[1][1]) - (arr[0][1] * arr[1][0]);
  
console.log(determinant);
 
  
   
/*
run:  
 
-18
 
*/

 

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