Diketahui f(x) = 15x + 10 dan g(x) = , x ≠ - 2
a) Tentukan rumus fungsi invers f⁻¹(x) dan g⁻¹(x)
f⁻¹(x) = 15x + 10
y = 15x + 10
15x = y - 10
x =
f⁻¹(x) =
g⁻¹(x) =
y =
y(x+2) = 2x
xy + 2y = 2x
xy - 2x = -2y
x(y - 2) = -2y
b) Hitunglah nilai f(2), f⁻¹(40), g(1) dan g⁻¹()
f(2) = 15(2) + 10 → 40
f⁻¹(40) = ⇒ → 2
g(1) = →
g⁻¹() ⇒ ⇒ ⇒ → 1
Mapel : Matematika
Kelas : 11 SMA
Bab : Fungsi dan Invers
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Verified answer
Diketahui f(x) = 15x + 10 dan g(x) = , x ≠ - 2
a) Tentukan rumus fungsi invers f⁻¹(x) dan g⁻¹(x)
f⁻¹(x) = 15x + 10
y = 15x + 10
15x = y - 10
x =
f⁻¹(x) =
g⁻¹(x) =
y =
y(x+2) = 2x
xy + 2y = 2x
xy - 2x = -2y
x(y - 2) = -2y
x =
g⁻¹(x) =
b) Hitunglah nilai f(2), f⁻¹(40), g(1) dan g⁻¹()
f(2) = 15(2) + 10 → 40
f⁻¹(40) = ⇒ → 2
g(1) = →
g⁻¹() ⇒ ⇒ ⇒ → 1
Mapel : Matematika
Kelas : 11 SMA
Bab : Fungsi dan Invers