Jawabanmu

2014-07-21T14:17:39+07:00
Pake integral nanti didapatkan

f(x) = 2x² + x + C
f(3) = 20 = 2.(3)² + 3 + c
20 = 18 + 3 + c
-1 = C

f(x) = 2x² + x - 1
f(2) = 2.2² + 2 -1
= 9

^_^
thanks udah bantu ya ^^
sama-sama, koreksi dulum takutnya da yang salah ngitung