Jawapan

2015-06-10T16:26:26+08:00
Aritmetik,
T2-T1 = T3-T2

x-2 = 8-x
x+x = 8+2
2x = 10
x = 5

Geometri,
T2/T1 = T3/T2

x/2 = 8/x
x darab x = 8 x 2
x^2 = 16
x = 4
2015-06-10T17:53:48+08:00
A)  jenjang aritmetika
      U₂ - U₁ = U₃ - U₂
      x - 2 = 8 - x
      x + x = 8 + 2
          2x = 10
            x = 10/2
            x = 5

b)  jenjang geometri
     \frac{ U_{2} }{U_{1}} = \frac{U_{3}}{U_{2}}  \\  \frac{x}{2} = \frac{8}{x}  \\  x^{2} =16 \\ x= \sqrt{16}  \\ x=4