tolong dibantu yaaa diketahui fungsi f(x)= 9-4x tentukan nilai a jika f(a)= -11

f(x) = 9 - 4x
f(a) = 9 - 4a
-11 = 9 - 4a
-11 - 9 = -4a
-20 = -4a
-20 : (-4) = a
5 = a

Materi : Fungsi

f(x) = 9 - 4x
diketahui f(a) = -11 , maka
f(a) = 9 - 4a
-11 = 9 - 4a
4a = 9 + 11
4a = 20
a = 5