jika f(×+2)=4×+1 maka f(4) adalah

[tex]x + 2 = 4 \\ x = 2[/tex]
Jadi, tinggal substitusi nilai x kedalam persamaan
f(4) = 4.2+1 =9

Semoga membantu^^

f(x+2)=4x+1

ditanya= f(4)...?

jawab:

x+2= a
x= a-2

=> f(a)= 4(a-2)+1
=> f(a)= 4a-8+1
=> f(a)= 4a-7


=> f(4)= 4(4)-7
=> f(4)= 16-7
=> f(4)= 9