Diketahui fungsi f(x):5x-4 jika f(-2):a dan f(b):11 hitung nilai a+b?

f(x) = 5x - 4
f(-2) = 5.-2 - 4 = -10 - 4 = -14
a = -14

f(b) = 5b - 4
11 = 5b - 4
11 + 4 = 5b
15 = 5b
b = 15/5 = 3

Maka,
a + b
= -14 + 3
= -11

f(x) = 5x-4
f(-2) = a
f(-2) = 5.(-2) - 4
= (-10) - 4
=-14
a = (-14)

f(x) = 5x - 4
f(b) = 11
5x - 4 = 11
5x = 11 + 4
5x = 15
x = 15/5
x = 3
b = 3

a+b
(-14) + 3
-11