nila dari dari soal tersebut adalah

[a = 7 Sigma 12] (a^2 + 4) - [a = 1 Sigma 6] (a^2 + 4a - 5)
= [a = 7 - 6 Sigma 12 - 6] ((a + 6)^2 + 4) - [a = 1 Sigma 6] (a^2 + 4a - 5)
= [a = 1 Sigma 6] (a^2 + 12a + 40) - [a = 1 Sigma 6] (a^2 + 4a - 5)
= [a = 1 Sigma 6] (a^2 + 12a + 40 - (a^2 + 4a - 5))
= [a = 1 Sigma 6] (8a + 45)
= (8.1 + 45) + (8.2 + 45) + (8.3 + 45) + ...... + (8.6 + 45)
= (53) + (61) + (69) + .... + 93
= n/2 (a + Un)
= 6/2 (53 + 93)
= 3 (146)
= 438