please explain the details.

Explain why the function is discontinuous at the given number a. add a f ( 2 ) = 2(2 -22 X 2- 4 a = 2 a ) f ( x ) is undefined 6 ) lim fly and im for ) are finite , but are not 2-2 - equal C ) 1TM fax) does not exist 76 72 d ) f ( 2) is defined and lim for is finite, but they are not equal