Diketahui fungsi f(x)=5x-4.jikaf(-2)=ada f(b)=11,nilai a+b adalah

f(x) = 5x - 4
f(-2) = a
a = 5(-2) - 4
a = -10-4 = -14
f(b) = 11
11 = 5x - 4
11 + 4 = 5x
15 = 5x
x = b = 3
Bukti :
f(b) = 11
f(5) = 5(3) - 4
f(5) = 15 - 4 = 11
Jadi, a + b = -14 + 11 = -3