Question

Diketahui f(x) = 3x + 10 . jika f(-1) = a dan f(b) = -2 , nilai a+b adalah...

Answer 1

F(-1)= 3(-1)+10
      =-3+10
   a = 7
f(b)= 3(b)+10 = -2
     = 3b = -12
     = b = -4
b + a = -4 +7
        = 3

Answer 2

F(-1) = a=7
f(b)=-2
3b+10=-2
3b=-12
b=-4
a+b = 7-4=3