Jumlah tak hingga deret x + 1 + 1/x + 1/x^ +........ = 4x Tentukan nilai X

Kelas 10 Matematika
Bab Barisan dan Deret Bilangan

r = U2/U1
r = 1/x

S∞ = 4x
a/(1 - r) = 4x
x/(x/x - 1/x) = 4x
x = 4x . (x - 1)/x
x = 4 (x - 1)
x = 4x - 4
4 = 4x - x
4 = 3x
x = 4/3