Jawabanmu

2014-05-28T19:18:10+07:00
X kuadrat - 3x - 4
(x-1) (x+4) ---->> x1 = 1 dan x2 = -4

2x1 + 5x2 = 2(1) + 5(-4)= -18
1 5 1
2014-05-28T19:20:23+07:00
X^2 -3x-4 = 0
(x-4)(x+1) =0
x1=4 x2=-1

nilai 2x1+ 5x2
2.4 + 5.(-1) = 8-5 = 3
beneran kamu heheh, aku salah yg pemfaktorannya :)
oke :)