Jawabanmu

2014-05-29T16:23:46+07:00
F(x) = (1/4)x² + bx + a =0
f(2) = 1 + 2b + a = 0 ⇔a + 2b = 1 ⇔ a = 1 - 2b
a + b = 1 - 2b + b
         = 1 - b                atau             a + b = (1/2)(1+a)