1. Diketahui f(x) = 2x-1, g(x) = 5-3x. Tentukanlah f o g (x)!
= f o g (x) = f (5-3x)
= 2(5-3x) - 1a
= 10-6x-1
= 9-6x
= -6x + 9
2. Diketahui f(x) dan g(x) seperti nomor 1 dan h(x) = 2x.x, tentukanlah f o g o h (x)!
= f o g o h (x) = f o g(2x.x)
= f{5-3(2x.x)}
= f(5-6x.x)
= 2(5-6x.x)-1
= 10-12x.x-1
= 9-12x.x
= -12x.x + 9
3. Dari soal nomor 2, tentukanlah f o g o h (-2)!
= f o g o h (-2) = f o g(2x.x)
= f{5-3(2x.x)}
= f(5-6x.x)
= 2(5-6x.x)-1
= 10-12x.x-1
= 9-12x.x
= 9-12(-2)(-2)
= 9-12(4)
= 9-48
= -39
4. Diketahui f(x) = 3x-2, g(x) = 6-6x dan h(x) = x.x, tentukanlah h o f o g (x)!
= h o f o g (x) = h o f(6-6x)
= h{3(6-6x)-2}
= h(18-18x-2)
= h(16-18x)
= (16-18x)(16-18x)
= 256-288x-288x+324x.x
= 256-576x+324x.x
= 324x.x - 576x + 256
5. Dari soal nomor 4, tentukanlah g o f o h (1)!
= g o f o h (1) = g o f(x.x)
= g{3(x.x)-2}
= g(3x.x-2)
= 6-6(3x.x-2)
= 6-18x.x+12
= 18-18(x.x)
= 18-18(1)(1)
= 18-18
= 0
Minggu, 17 November 2013
Jumat, 11 Oktober 2013
KALKULUS (HIMPUNAN)
Misalkan : S
= {x │ x bilangan bulat positif, x ≤ 10}
P
= {1, 2, 3, 7}
Q
= {2, 4, 6, 9}
R
= {1, 3, 5, 8}
(P U Q) ∩ (P’ ∩ R)’ = P U (Q’ U R)’
P U Q = {1, 2, 3, 7} U
{2, 4, 6, 9}
= {1, 2, 3, 4,
6, 7, 9}
P’ = {4, 5, 6, 8,
9, 10}
P’ ∩ R = {4, 5, 6, 8,
9, 10} ∩ {1, 3, 5, 8}
= {5, 8}
(P’ ∩ R)’ =
{1, 2, 3, 4, 6, 7, 9, 10}
(P U Q) ∩ (P’ ∩ R)’ = {1, 2, 3, 4, 6, 7, 9} ∩ {1, 2, 3,
4, 6, 7, 9, 10}
=
{1, 2, 3, 4, 6, 7, 9}
Q’ = {1, 3, 5, 7,
8, 10}
Q’ U R = {1, 3, 5, 7,
8, 10} U {1, 3, 5, 8}
= {1, 3, 5, 7,
8, 10}
(Q’ U R)’ =
{2, 4, 6, 9}
P U (Q’ U R) = {1, 2, 3, 7} U {2, 4, 6, 9}
=
{1, 2, 3, 4, 6, 7, 9}
(P U Q) ∩ (P’ ∩ R)’ = P U (Q’ U R)
{1, 2, 3, 4, 6, 7, 9} = {1, 2, 3, 4, 6, 7, 9}
Jadi terbukti sama.
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