Question

Diketahui f(x) fungsi linear. jika f(3x+4)=6x+1, nilai f(3) adalah..

Answer 1

Verified answer

◾ Materi : Fungsi
◾ Sub materi : Fungsi
◾ Mapel : Matematika
◾ Kelas : VIII SMP (KTSP)
◾ Keyword : Fungsi Aljabar

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Jawab :
f(3x+4) = 6x+1
misalkan :
u = 3x+4
3x = u-4
x =

substitusikan ke fungsi
f(u) = 6 ( ) + 1
f(u) = 2 ( u-4 ) + 1
f(u) = 2u-8+1
f(u) = 2u-7

kembalikan ke fungsi f(x)
f(x) = 2x-7

maka,
f(3) = 2(3) - 7
f(3) = 6-7



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