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

Jawaban:

f(x)=3x + 10

f(1)= a

a =3.1 + 10

a =3 + 10

a =13

f(b)=-2

-2 =3.b + 10

-2 =3b + 10

-2-10 =3b

-12 = 3b

-4 = b

maka nilai

a+b =

13+(-4) = 9