Jawaban:

1. (-15)

2. x = (-2)

3. {0, 1, 2}

Penjelasan dengan langkah-langkah:

1)

Diketahui :

f(x) = 2 - 5x

f(2) - f(-1)?

Jawab :

f(2) = 3 - 5(2)

f(2) = 3 - 10

f(2) = -7

f(-1) = 3 - 5(-1)

f(-1) = 3 - (-5)

f(-1) = 8

f(2) - f(-1)

= -7 - 8

= -15

2)

Diketahui :

f(x) = 3x - 2

f(x) = -8

Jawab:

-8 = 3x - 2

-8 + 2 = 3x

-6 / 3 = x

x = -2

3)

Diketahui :

Df = {3, 4, 5}

f(x) = x - 3

Rf?

Jawab :

masukin satu satu domain fungsi ke fungsi

f(3) = x - 3

f(3) = 3 - 3

f(3) = 0

f(4) = x - 3

f(4) = 4 - 3

f(4) = 1

f(5) = x - 3

f(5) = 5 - 3

f(5) = 2

jadi Rf = {0, 1, 2}

maaf kalo ada yang kurang teliti mohon di koreksi ya :D