Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) If `A=[[x,3,2],[-3,y,-7],[-2,7,0]]`and `A=A^1`, then x+y is equal to - Sarthaks eConnect

If `A=[[x,3,2],[-3,y,-7],[-2,7,0]]`and `A=A^1`, then x+y is equal to

-1