f (x) = 6 - 3x Nilai f (5) - f (-4) = Tolong bantu... beserta caranyaa

pelajaran: matematika
kelas ix
kata kunci: fungsi

diketahui;
f(x)=6-3x

ditanya:
nilai f(5)- f(-4)=....?

jawab:
masukan (x) di f(5) dan f(-4)
f(5)=6-3(5)=6-15= -9
f(-4)=6-3(-4)=6+12=18

f(5)-f(-4)= -9-18= -27

f(x) = 6-3x
f(5) = 6-3(5)
f(5) = 6-15
f(5) = -9

f(x) = 6-3x
f(-4) = 6-3(-4)
f(-4) = 6+12
f(-4) = 18

maka,
f(5)-f(-4)
=(-9)-(18)
= -27