Jawab:
pola bilangan
Penjelasan dengan langkah-langkah:
a+ ( a+ 1) + (a + 2) +.. + 50 = 1.139
u1= a
b = 1
Un = 50
a + (n - 1 )b = 50
a + (n - 1)1 =50
a + n - 1 = 50
n = 50 - a + 1
n = 51 - a
Sn = 1.139
n/2 (a + un) = 1.139
(51 - a) ( a+ 50) = 2 (1.139)
51 a + 2.550 - a² - 50 a = 2.278
-a² + a + 2.550 - 2.278 =0
-a² + a + 272 = 0
a² - a - 272 = 0
(a - 17)(a + 16) = 0
a = 17 atau a = - 16
a > 0 maka a = 17
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Verified answer
Jawab:
pola bilangan
Penjelasan dengan langkah-langkah:
a+ ( a+ 1) + (a + 2) +.. + 50 = 1.139
u1= a
b = 1
Un = 50
a + (n - 1 )b = 50
a + (n - 1)1 =50
a + n - 1 = 50
n = 50 - a + 1
n = 51 - a
Sn = 1.139
n/2 (a + un) = 1.139
(51 - a) ( a+ 50) = 2 (1.139)
51 a + 2.550 - a² - 50 a = 2.278
-a² + a + 2.550 - 2.278 =0
-a² + a + 272 = 0
a² - a - 272 = 0
(a - 17)(a + 16) = 0
a = 17 atau a = - 16
a > 0 maka a = 17