Question

1.fungsi G di tentukan oleh g(x) = -5x
+ 1 pada himpunan bilangan bulat.
tentukan:
a. bayangan 2 pada g,
b. nilai g (0),
c. nilai g jika x = - 1,
d. nilai x jika g(x)= - 14,
e. nilai a jika g(a) = 21.

Answer 1

G(x) = -5x + 1
a) bayangan 2 pada g :
g(2) = -5(2) + 1
g(2) = -10 + 1
g(2) = -9

b) nilai g(0):
g(0) = -5(0) + 1
g(0) = 0 + 1
g(0) = 1

c) nilai g jika x = -1
g(-1) = -5(-1) + 1
g(-1) = 5 + 1
g(-1) = 6

d) nilai x jika g(x) = -14
-14 = -5x + 1
5x = 14 + 1
5x = 15
x = 15 : 5
x = 3

e) nilai a jika g(a) = 21
g(a) = -5(a) + 1
21 = -5a + 1
5a = 1 - 21
5a = -20
a = -20 : 5
a = -4