Question

Jika f(x)= 3x + 2 , f(a)= 20 dan f(2)= b , maka nilai a + b adalah ........
a.6
b.8
c.14
d.16
tolong ya .... jawabannya yg benner 14 tapi caranya gimna ya ...

Answer 1

1) f(a) = 3*a+2
20 = 3a+2
20-2=3a
18=3a
18/3=a
a=6
2) f(2) = 3*2+2
   = 6+2
   = 8
a+b = 6 + 8 = 14

Answer 2

F(x)=3x+2

f(a)=20
20=3(a)+2
20=3a+2
20-2=3a
18=3a
18:3=a
a=6

f(2)=b
f(2)=3(2)+2
f(2)=6+2
f(2)=8
b=8

a+b = 6+8
=14