Question

Fungsi f ditentukan oleh g(x) = -3x + 6 tentukan:
a.bayangan -3 oleh fungsi tersebut,
b.nilai g jika x = -4
c.nilai x jika g(x) = -18
d.nilai a jika g(a) = 21

Mohon bantuannya sekarang yah (pake caranya juga)

Answer 1

G(x) = -3x + 6

soal a
g(x) = -3x + 6
g(-3) = -3(-3) + 6
g(-3) = 9 + 6
g(-3) = 15

soal b
g(-4) = -3(-4) + 6
g(-4) = 12 + 6
g(-4) = 18

soal c
g(x) = -3x + 6 = -18
-18 = -3x + 6
-18 - 6 = -3x
-24 = -3x
24 = 3x
24/3 = x
x = 8

soal d
g(a) = -3a + 6 = 21
21 = -3a + 6
21 - 6 = -3a
15 = -3a
-15 = 3a
-15/3 = a
a = -5