Question

F(x)=ax+b jika f(1)=-1 dan f(3)5 maka nilai 2a+2b adalah

Answer 1

F(x) = ax+b
f(1) = 1a+b = -1
f(3) = 3a+b = 5
jawab..
1a(3)+b(3) =-1(3)
3a+b =5
------------------ -
      2b = -8
        b = -4
masukan nilai b
3a+b = 5
a = 5-(-4)/3
a = 3
Jadi 2a+2b = 2(3) + 2(-4)
                 = -2

Answer 2

[/tex]+ b \\ 5 - 3a -b = a+b+1 \\ = 5 - 1 = 4a + 2b \\ 4 = 4a + 2b[/tex]