Jawabanmu

2014-09-07T20:33:29+07:00
F(x)= x2 + bx- b
F(3)= 19
f(3)= 3(kuadrat) + 3b -b = 19
9 + 2b = 19
2b= 10
B=5

B+1 /2 = (5 + 1) /2 = 3
3 4 3