If \[A\text{ }=\text{ }7{{m}^{2}}+3mn-8{{n}^{2}},\text{ }B\text{ }=-4{{m}^{2}}+mn\]\[+4{{n}^{2}}\]and C = 3n2 - 4m2 - 4mn. Then find the value of A + B + C.

\[-\left( {{m}^{2}}+{{n}^{2}} \right)\]

If \[A\text{ }=\text{ }7{{m}^{2}}+3mn-8{{n}^{2}},\text{ }B\text{ }=-4{

1.	If \[A\text{ }=\text{ }7{{m}^{2}}+3mn-8{{n}^{2}},\text{ }B\text{ }=-4{{m}^{2}}+mn\]\[+4{{n}^{2}}\]and C = 3n2 - 4m2 - 4mn. Then find the value of A + B + C.
A.	\[-{{m}^{2}}+mn-{{n}^{2}}\]
B.	\[-{{m}^{2}}-mn-{{n}^{2}}\]
C.	\[-{{m}^{2}}+{{n}^{2}}\]
D.	\[-\left( {{m}^{2}}+{{n}^{2}} \right)\]
E.	None of these
Answer» E. None of these