Bantuin dong kak, beserta caranya ya

Mapel : Matematika

Kelas : 10

Bab : Relasi dan Fungsi


Misalkan '

2x - 1 = y

2x = y + 1

x = (y + 1)/2


Maka, nilai fungsi f(x)

f(x) = 4(x + 1)/2 - 7

f(x) = 2x + 2 - 7

f(x) = 2x - 5


→ f(5)

= 2(5) - 5

= 10 - 5

= 5 ✔

→ f(3)

= 2(3) - 5

= 6 - 5

= 1



Sehingga :

= f(5) + f(3)

= 5 + 1

= 6 → opsi D ✔