Tolong bntu dongg,soalnya saya ga ngerti

Jawab:

Penjelasan dengan langkah-langkah:

1. a = 4 –> 4*4 – 3 = 16 – 3 = 13

  a = 5 –> 4*5 – 3 = 20 – 3 = 17

  a = 6 –> 4*6 – 3 = 24 – 3 = 21

  a = 7 –> 4*7 – 3 = 28 – 3 = 25

<=> 13 + 17 + 21 + 25 = 76 (A)

2. k = 1 –> (1^2 + 3*1 – 8) / 12 = (1+3-8)/12 = -4/12

   k = 2 –> (2^2 + 3*2 – 8) / 12 = (4+6-8)/12 = 2/12

   k = 3 –> (3^2 + 3*3 – 8) / 12 = (9+9-8)/12 = 10/12

   k = 4 –> (4^2 + 3*4 – 8) / 12 = (16+12-8)/12 = 20/12

   k = 5 –> (5^2 + 3*5 – 8) / 12 = (25+15-8)/12 = 32/12

<=> -4/12 + 2/12 + 10/12 + 20/12 + 32/12 = 60/12 = 5 (C)