jika u1=7 dan b=3 maka suku ke -25 adalah

Halo, selamat malam kawan :)
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Mapel : Matematika
Tentang : Barisan Aritmatika
Pertanyaan yg diajukan : 2
Pembahasan :

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Nomor 1 :

Suku Pertama (U1) : 7
Beda (b) : 3

U25 = U1 + (n - 1) x b
U25 = 7 + (25 - 1) x 3
U25 = 7 + 24 x 3
U25 = 7 + 72
U25 = 79

Jawaban : C

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Nomor 2 :

Suku Pertama (U1) : 40
Beda (b) : -7

U30 = U1 + (n - 1) x b
U30 = 40 + (30 - 1) x (-7)
U30 = 40 + 29 x (-7)
U30 = 40 + (-203)
U30 = (-163)

Jawaban : A

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Hopefully this is the best for you. And please, MAKE BRAINLY GREAT AGAIN!!!

✚ Heil Manstein! ✚