Question

DERET GEOMETRI
DIk:U3=18
U6=486
U7=?
pakek cara ya biar ngerti

Answer 1

U6 = a+5b = 486
u3 = a+2b = 18
terus di kurang
3b = 468
b = 156

a+2b = 18
a+2.156 = 18
a+312 = 18
a = 18-312
a = -294

u7 = -294 + 6.156
= -294 + 936
= 632

maaf kalau salah

Answer 2

U3=ar^2=18
U6= ar^5= 486
= ar^2.r^3=486
18. r^3= 486
r^3= 486/18= 27
r= 3
ar^2=18
a. 3^2=18
a= 18/9 = 2
U7= ar^6= 2. 3^6 = 2. 729 = 1458