Question

Diketahui fungsi f:x = f(x), dimana dirumuskan bahwa f(x) = 5x + 4. Tentukan :
a. nilai f(2)
b. nilai f(-10)
c. nilai f(4)
d. nilai a jika f(a) = 21

Answer 1

F(x)=5x+4
f(2)=5.2+4 = 10+4=14
f(-10)=5.(-10)+4=-50+4=-46
f(4)=5.4+4=20+4=24
f(a)=21=5a+4
        17=5a
           a=3 2/5 atau 17/5

Answer 2

F(2) = 5.2 + 4 = 20 + 4 = 24 F(-10) = 5.(-10) + 4 = -50 + 4 = -46 F(4) = 5.4 + 4 = 20 + 4 = 24 F(a) = 21 - 5a + 4 F(-5a) = 25 F(a) = -5