Question

Diketahui rumus suku ke n suatu barisan bilangan. Untuk = -5n-2.
A. tentukan 4 suku yg pertama (U1,U2,U3,U4)
B. tentukan nilai dari U10-U8.​

Answer 1

Penjelasan dengan langkah-langkah:

suku 1 = -5n-2 = -5*1-2 = -5-2 = -7

suku 2 = -5n-2 = -5*2-2 = -10-2 = -12

suku 3 = -5n-2 = -5*3-2 = -15-2 = -17

suku 4 = -5n-2 = -5*4-2 = -20-2 = -22

U10 = -5n-2 = -5*10-2 = -50-2 = -52

U8 = -5n-2 = -5*8-2 = -40-2 = -42

U10-U8 = -52-(-42) = -52+42 = -10

Answer 2

Jawaban:

A U1=-5n-2

=-5(1)-2

=-5-2

= -7

U2=-5n-2

= -5(2)-2

= -10-2

=-12

U3=-5n-2

=-5(3)-2

=-15-2

=-17

U4=-5n-2

=-5(4)-2

= -20-2

=-22

B U10=-5n-2

=-5(10)-2

=-50-2

= -52

U8=-5n-2

=-5(8)-2

= -40-2

= -42

U10-U8

=-52-(-42)

=-52+42

= -10