Answer:
2 1/4.
Step-by-step explanation:
-5 1/2 + 7 3/4
= 7 3/4 - 5 1/2
= 7 - 5 + 3/4 - 1/2
= 2 + 1/4
= 2 1/4.
2 1/4
-11/2+7 3/4
-11/2 + 31/4
= 9/4
= 2 1/4
(x+11)(x-11)
A ^2 - B ^2 =(A+B) (A-B).. (*)
x^2 - 121=
x^2 - 11^2=(*)