Question

Barisan Aritmatika
Dik : U7 = 7 dan U6 = 19
Dit : U10?..

Answer 1

B = U7 - U6
= 7 - 19
= -12

karena U7 = a+6b
a +6(-12) = 7
a -72 = 7
a = 7+72
a = 79

U10 = a+9b
= 79 + 9(-12)
= 79 + (-108)
= (-29)

Answer 2

Beda :
( 7 - 19 ) : ( 7 - 6 ) = -12

Awal :
7 = a + 6b
7 = a - 72
a = 79

Suku ke 10 :
U₁₀ = a + 9b
      = 79 - 108
      = -29