Question

Fungsi f(x) = 3x + n dan f(-1) = 7. nilai f(5) - f(1) =

Answer 1

F(x) = 3x + n
f (-1) => 3x - 1 = 7
=> 3x = 8
=> x = 8/3

f (5) = 3.x + 5
=> (3. 8/3) + 5
=> 8 + 5
=> 13

F(1) = 3x + 1
=> (3.8/3) + 1
=> 8 + 1
=> 9

jadi, f(5) - f(1) = 13 - 9 = 4

Answer 2

F(x)=3x+n
f(-1)=3(-1)+n=7
=>-3+n=7
=>n=10
f(5)= 3(5)+10=15+10=25
f(1)=3(1)+10=3+10=13
f(5)-f(1)=25-13=12