Jika f(a)= 8, dan f(b)= –13, maka a+b=?
A. 7
B. 3
C. –3
D. –7
Jwb dgn caranya 😀
Diket f(x)=3x–7.
Jawaban:
f(x) = 3x – 7
jika
f(a) = 8
f(b) = -13
maka, nilai a + b ?
f(x) = 3x – 7
f(a) = 3a – 7 = 8
3a = 8 + 7
3a = 15
a = 15/3
a = 5
Untuk b :
f(x) = 3x – 7
f(b) = 3b – 7 = -13
3b = -13 + 7
3b = -6
b = -6/3
b = -2
maka, hasil dari :
= a + b
= 5 + (-2)
= 5 – 2
= 3
Jawaban (B) 3