Jawapan

2015-06-12T21:04:40+08:00
A)  r = x⁴/x²
       = x²

b) $\begin{align} \ S  \ { \infty}  &= \frac{ a}{ 1-r }\\3&= \frac{ 1 }{1- x^{2}  }\\3(1- x^{2} )&=1 \\ 3-3 x^{2} -1&=0 \\ 3 x^{2} -2&=0 \end{align}