diketahui fungsi f (x)=5x-4 jika f (-2)=a dan f (b)=11, nilai a+b adalah

Mapel : Matematika

Kelas : 8

Bab : Relasi dan Fungsi
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f(-2) = a
5(-2) - 4 =a
-10 - 4 = a
-14 = a

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


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

f(x) : 5x-4

f(-2) : 5.(-2)-4 = a
-10-4 = a
a = -14
f(b) : 5b-4 = 11
5b = 15
b = 3

jadi , a + b : -14+3
: -11