Question

F(x)=ax+b, jika f(2)=14, f(5)=26 maka nilai f (-3) + f(4) adalah

Answer 1

F(x)  ax +b
f(2) = a(2) +b = 14
       = 2a +b = 14
f(5) = a(5) +b = 26
       = 5a +b = 26
2a +b = 14
5a +b = 26  -
      -3a = -12
       a = -12/-3
       a = 4
2a +b = 14
2(4) +b = 14
8 +b = 14
b = 14 -8
b = 6
f(x) = 4x +6
f(-3) = 4(-3) +6
         = -12 +6
         = -6
f(4) = 4(4) +6
       = 16 +6
       = 22
Maka,
f(-3) +f(4)
= -6 +22
= 16
Itu jawabannya.

Answer 2

F(2)=a(2)+b
14=2a+b.
f(5)=a(5)+b
26=5a+b.

2a+b=14
5a+b=26 terus di kurang
hasilnya. -3a=-12. a=-12 dibagi -3. a=4

2(4)+b=14
8+b=14
b=14-8
b=6


f(-3)=4(-3)+6
=-12+6
=-6


f(4)=4(4)+6
=16+6
=22