Question

Tolong dijawab .. klo bisa pake cara ya, soalnya gk ngerti

Answer 1

1. f(x)=ax+b
f(3)=9-------> 3a+b=9
f(1)=-11------> a+b=-11
-------------(-)
2a=20
a=10
a+b=-11
10+b=-11
b=-21

a. f(x)=10x-21

b. f(-4)=10(-4)-21
=-61

c. f(x)=-5
10x-21=-5
10x=-5+21
10x=16
x=16/10
x= 8/5

2. f(1/x -1) = 6x+2

misal f(1/x-1)=a
1/x -1=a
1/x=a+1
x=1/(a+1)
f(a)=6((1/(a+1))+2
=6/(a+1) +2
a. f(x)=6/(x+1) +2

b. 2f(3) -2f(-3)=2{f(3)-f(-3)
2{(6/(3+1) +2) - (6/(-3+1) +2)}
2{6/4 +2 - (6/-2+2)}
2(6/4 +2+6/2-2)
3+4+6-4
9

3. g(x)=3x^2 - 4x + 5

a. g(3) =3^2-4(3)+5
=9-12+5
=2

b. g(3+a) =(3+a)^2-4(3+a)+5
=9+6a+a^2-12-4a+5
=a^2+2a+3