Question

Diketahui barisan Aritmetika U4:12 dan U8:24 tentukan u50

Answer 1

Semoga membantu..........................

Answer 2

Rumus brisan arimatika adlah Un= u1+(n-1)b
U4 = U1+(4-1)b
12 = u1 +3b......1

U8= U1+(8-1)b
24= U1+7b.....2

3liminasi perz 1 dan 2
12= u1+3b
24= u1+7b
_________-
-12=-4b
b = 3

subtitusi b=3 ke prs 1
12= u1+3b
12= u1+3(3)
12= u1+9
U1= 12-9
u1= 3

u50 = u1+(n-1)b
=3+(50-1)3
=3+49x3
= 3+147
= 150