Question

Diketahui f(x)=x²-5x+8 jika f(a)=2 , tentukan nilai a ?

Answer 1

F(a)=a^2 - 5a + 8 = 2
       a^2 - 5a + 6 = 0
       (a - 3) (a-2) = 0
     a = 3 atau a = 2

Answer 2

Substitusi menghasilkan
a² - 5a + 8 = 2
a² - 5a + 8 - 2 = 0
a² - 5a + 6 = 0
(a - 3) (a - 2) = 0
maka nilai a = 2 atau a = 3