BARISAN DAN DERET
2, 6, 14, 26, 42, A, . . .
0, -10, -40, -102, -208, B, . . .
Nilai (A - B) yg memenuhi adalah ....
A. -370
B. -308
C. -162
D. 62
E. 432
Ngasal, Auto report yya ..
2, 6, 14, 26, 42, A, . . .
0, -10, -40, -102, -208, B, . . .
Nilai (A - B) yg memenuhi adalah ....
A. -370
B. -308
C. -162
D. 62
E. 432
Ngasal, Auto report yya ..
Verified answer
Jawaban:
[Deret dan Barisan Aritmatika]
Penjelasan dengan langkah-langkah:
U=2, 6, 14, 26, 42,
X= 4. 8. 12. 16. beda tk.1
Y= 4. 4. 4. beda tk.2
Y=2a
4=2a
a = 4/2
a = 2
X = 3a+b
4 = 3(2)+b
4 = 6 + b
b = 4-6
b = -2
U = a+b+c
2 = 2+(-2)+c
2 = 0+c
2 = c
Un = an²+bn+c
= 2n²-2n+2
U₆ = 2(6)²-2(6)+2
= 2(36)-12+2
= 72-10
= 62
U=0, -10, -40, -102, -208, -370
-10. -30. -62. -106. -162
-20. -32 -44. -56
-12. -12. -12
A = 62
B = -370
A-B = 62 - (-370)
= 62 + 370
= 432
⇒ Opsi E.
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