a. (2+2)4=C4024+C4123.(2)+C4222.(2)2+C432.(2)3+C44(2)4
=16+322+48+162+4
=68+482.
b. (2+2)4 + (2−2)4
=C4024+C4123.(2)+C4222.(2)2+C432.(2)3+C44(2)4
+C4024+C4123.(−2)+C4222.(2)2+C432.(−2)3+C44(2)4
=68+482 + 0
=16+322+48+162+4+16−322+48−162+4
=32+96+8
=136
c. (1−3)5=C5015+C5114.(−3)+C5213.(−3)2
+C5312.(−3)3+C541.(−3)4+C55(−3)5
=1−53+30−303+45−93
=76−443