Penjelasan dengan langkah-langkah:

Fungsi Relasi

Nomor (6)

f : x → x² + 5x - 7 , bayangan dari 3

Maka:

f(x) = x² + 5x - 7

f(3) = 3² + 5(3) - 7

f(3) = 9 + 15 - 7

f(3) = 9 + 8

f(3) = 17

Nomor (7)

f(x) = 2x + 3, jika peta p = -5 , nilai p yang memenuhi?

Maka:

f(p) = -5

2x + 3 = f(x)

2p + 3 = f(p)

2p = f(p)-3

2p = -5-3

2p = -8

p = -8/2

p = -4

Nomor (8)

f : x → ax + b , jika f(2) = 3 dan f(3) = 5

Nilai a - b?

Maka:

ax + b = f(x)

3a + b = 5

2a + b = 3

_________ _

a = 2

substitusi nilai a ke:

2a + b = 3

b = 3 - 2a

b = 3 - 2(2)

b = 3-4

b = -1

Maka, nilai a = 2 dan b = -1

= a - b

= 2 - (-1)

= 2+1

= 3