tolong bantu jawab dong hari ini mau di kumpulin
1. 2
2. a. U7 = 28
U10 = 55
b. 72
3. C. Un = 4n + 2
Penjelasan dengan langkah-langkah:
1. -16, -10, -4, x, 8, 14
+6. +6 +6 +6 +6
x = -4 + 6
= 2
2. U1 = 1 = 1 x (1/2 x (1 + 1))
U2 = 3 = 2 x (1/2 x (2 + 1))
U3 = 6 = 3 x (1/2 x (3 + 1))
U4 = 10 = 4 x (1/2 x (4 + 1))
Un = n x (1/2 x (n + 1))
a. U7 = 7 x (1/2 x (7+1))
= 7 x 1/2 x 8
= 28
U10 = 10 x (1/2 x (10+1))
= 10 x 1/2 x 11
= 55
b. U7 = 28
U9 = 9 x (1/2 x (9+1))
= 9 x 1/2 x 10
= 45
U7 + U9 = 27 + 45 = 72
3. U1 = 2 + 4 x 1 = 6
U2 = 2 + 4 x 2 = 10
U3 = 2 + 4 x 3 = 14
Un = 2 + 4 x n = 2 + 4n = 4n + 2
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