Jawabanmu

2014-06-13T11:53:24+07:00
     4 x ² - 25 = 0
⇔  4 x ² = 25
⇔ x ² = 25 / 4
⇔ x  = 5 / 2

   x / 3 + 3 / x = 0
⇔ 3 { x / 3 + 3 / x }  = 3 . 0
⇔ x + 9 / x = 0
⇔ x { x + 9 / x } = x . 0
⇔ x² + 9 = 0