Jawab:
Penjelasan dengan langkah-langkah:
No. 10
misal ¹²㏒ 3 = a
maka p = a + a² + a³ + a⁴ + ...
= a + a (a + a² + a³ + a⁴ + ...)
maka p = a + ap
p - ap = a
p (1 - a) = a
p = a / (1 - a)
= ¹²㏒ 3 / (1 - ¹²㏒ 3)
= ¹²㏒ 3 / (¹²㏒ 12 - ¹²㏒ 3)
= ¹²㏒ 3 / (¹²㏒ 12/3)
= ¹²㏒ 3 / ¹²㏒ 4
p = ⁴㏒ 3
maka 4 pangkat p + 1 = 4 pangkat ⁴㏒ 3 + ⁴㏒ 4
= 4 pangkat ⁴㏒ 3 x 4
= 4 pangkat ⁴㏒ 12
= 12
No. 11
(f o g)(x) = 1 - 2/(x - 4)
f(x) = 1/x
misal g(x) = a
(f o g)(x) = 1/a = 1 - 2/(x-4)
1/a = [(x - 4) - 2]/(x-4)
1/a = (x - 6) / (x - 4)
a = g(x) = (x - 4) / (x - 6)
g(x) ≤ f(x)
(x - 4) / (x - 6) ≤ 1 / x
(x - 6) / (x - 4) ≥ x
x - 6 ≥ x (x - 4)
x - 6 ≥ x² - 4x
x² - 4x ≤ x - 6
x² - 4x - x + 6 ≤ 0
x² - 5x + 6 ≤ 0
(x - 3)(x - 2) ≤ 0
x - 3 = 0
x = 3
x - 2 = 0
x = 2
++++ - - - - ++++
------ 2 -------- 3 ------
{ x ∈ R | 2 ≤ x ≤ 3}
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Jawab:
Penjelasan dengan langkah-langkah:
No. 10
misal ¹²㏒ 3 = a
maka p = a + a² + a³ + a⁴ + ...
= a + a (a + a² + a³ + a⁴ + ...)
maka p = a + ap
p - ap = a
p (1 - a) = a
p = a / (1 - a)
= ¹²㏒ 3 / (1 - ¹²㏒ 3)
= ¹²㏒ 3 / (¹²㏒ 12 - ¹²㏒ 3)
= ¹²㏒ 3 / (¹²㏒ 12/3)
= ¹²㏒ 3 / ¹²㏒ 4
p = ⁴㏒ 3
maka 4 pangkat p + 1 = 4 pangkat ⁴㏒ 3 + ⁴㏒ 4
= 4 pangkat ⁴㏒ 3 x 4
= 4 pangkat ⁴㏒ 12
= 12
No. 11
(f o g)(x) = 1 - 2/(x - 4)
f(x) = 1/x
misal g(x) = a
(f o g)(x) = 1/a = 1 - 2/(x-4)
1/a = [(x - 4) - 2]/(x-4)
1/a = (x - 6) / (x - 4)
a = g(x) = (x - 4) / (x - 6)
g(x) ≤ f(x)
(x - 4) / (x - 6) ≤ 1 / x
(x - 6) / (x - 4) ≥ x
x - 6 ≥ x (x - 4)
x - 6 ≥ x² - 4x
x² - 4x ≤ x - 6
x² - 4x - x + 6 ≤ 0
x² - 5x + 6 ≤ 0
(x - 3)(x - 2) ≤ 0
x - 3 = 0
x = 3
x - 2 = 0
x = 2
++++ - - - - ++++
------ 2 -------- 3 ------
{ x ∈ R | 2 ≤ x ≤ 3}