Question

Tolong dijawab no 37 & 38 bsk di kmpl. Dgn jalannya ya trims

Answer 1

Verified answer

MAPEL = MATEMATIKA
KELAS = 9
BAB = BARISAN & DERET

----------- Barisan Aritmatika --------

37.)
bentuk barisan :
y, ( 2y + 1 ), 53, ....

U1 = a = y
U2 = ( 2y + 1 )
U3 = 53

beda :
= U2 - U1
= ( 2y + 1 ) - y
= y + 1

U3 = 53
➡ a + 2b = 53
➡ y + 2( y + 1 ) = 53
➡ y + 2y + 2 = 53
➡ 3y = 53 - 2
➡ 3y = 51
➡ y = 51/3
➡ y = 17

jadi, U1 = y = 17

38.)
bentuk barisan :
( m + 1 ), 2m, 41, .....

U1 = a = ( m + 1 )
U2 = 2m
U3 = 41

beda :
= U2 - U1
= 2m - ( m + 1 )
= m - 1

U3 = 41
➡ a + 2b = 41
➡ ( m + 1 ) + 2( m - 1 ) = 41
➡ m + 1 + 2m - 2 = 41
➡ 3m - 1 = 41
➡ 3m = 41 + 1
➡ 3m = 42
➡ m = 42/3
➡ m = 14

beda :
= m - 1
= 14 - 1
= 13

jadi, bedanya = 13
semoga membantu