Jawabanmu

2014-03-27T00:07:33+07:00
B. -5
F(a) = 2a-3
-13 = 2a - 3
-13 + 3 = 2a
-10 = 2a
-5 = a
2014-03-27T01:43:14+07:00
f(x)= 2x-3
f(a)= 2a-3
13= 2a-3
2a=13+3
a=16/2
a=8