If Are Real Numbers, Find

If are real numbers, find

A) f ( a ) + f ( h ) = a ² + h ² + a + h + 6
B) f ( a ) + f ( h ) = a ² + h ² - a - h + 6
C) f ( a ) + f ( h ) = a ² + h ² - a - h
D) f ( a ) + f ( h ) = a ² + h ² - a - h - 6
E) f ( a ) + f ( h ) = a ² + h ² + a + h