f(x)=15-2x nilai f(b)=7 tentukan nilai b

Bab Fungsi
Matematika SMP Kelas VIII

f(b) = 7
15 - 2b = 7
-2b = 7 - 15
b = -8/-2
b = 4

f(x) = 15-2x=7
f(x)= -2x = 7-15
f(x) = -2x = -8
f(x)= x = -8/-2
f(x)= 4

jd f(10) = 15-2x4
= 15-8
=7