suku ke-5 barisan geometri adalah 162 suku ke-7 adalah 1458.suku ke 12 adalah

Langsung aja y

r = (U7:U5)^1/(7-5)
r = (1.458 : 162)^1/2
r = 9^1/2
r = (3²)^1/2
r = 3

U12 = U7 × r^5
U12 = 1.458 × 3^5
U12 = 1.458 × 32
U12 = 46.656

Semoga berguna +_+

[tex] \frac{U7}{U5} = \frac{a r^{6} }{a r^{4} } = \frac{1458}{162} [/tex]
[tex] r^{2} = 9[/tex]
r=3

disubstitusikan ke U5

U5= a[tex] r^{4} = 162[/tex]
= a[tex] 3^{4} [/tex] = 162
a = [tex] \frac{162}{81} = 2[/tex]
a = 2


U12?
U12 = a[tex] r^{11} [/tex]
= 2[tex] 3^{11} [/tex]
= 2 × 177147
= 354294