Petunjuk:
- Pilihlah 4 soal dari bagian A (matrik) dan 3 soal dari bagian B (fungsi multivariable) untuk anda kerjakan.
- Bagian A dan B hendaknya dikerjakan dalam satu bagian.
A. Matrik
1.
a. Diketahui Matrik A dan B dan matrik B=.
Buktikan bahwa A.I=I.A=A.
Hitung determinan matik B.
b. Jika A=dan
B=(6 1 9). Hitunglah A.B
2.
Jika A adalah matik simetris
dan A=. Tentukan nilai a dan b serta hitung determinan A.
3.
For what value of u and v does
4.
Using the matrices , calculate, (i). 3A+2B-2C+D
(ii). A.B and (iii). C.(A.B)
5.
Diketahui matrik A dan B; . Tunjukkan bahwa: (i). ABBA,
(ii). A.B=0 does not imply that either A or B is 0,
(iii). AB=AC and A do not imply that B=C
6.
Tentukan
nilai x, y dan z dari matrik berikut
7.
Dari matrik P dan Q, diketahui bahwa P.Q=I. , maka:
- Tentukan matrik Q
- Matrik C dimana
B. Fungsi
Multivariable
1.
a). Suppose a firm has an order for 200
units of its product and wishes to distribute its manufacture between two of
its plans, plant 1 and plant 2. Let q1 and q2 denote the outputs of plants one
and two, respectively, and suppose the total cost function is given by How should the output
be distributed in order to minimize costs?
b).The production function a
firm is . The cost to the firm of l and k is 4 and 8 per unit,
respectively. If the firm wants the total cost of input to be 88, find the
greatest output possible subject to this budget constraint.
2.
a). A consumer has the utility function U(x,y)=x.y and faces the budget constraint 2x+y=100. Find
the only possible solution to the consumer demand problem.
b). A monopolist produces two goods x and y for which the demand
functions are and . The joint total cost function is . Find (a). the profit-maximizing level of output, (b). the
profit maximizing price for each product and (c). the maximum profit.
3. Tentukan turunan partial tingkat satu dari
fungsi-fungsi berikut:
a. Z = 7x3e5xy b. Z = 6xye-(5x+2)
c. d.
4. Untuk fungsi-fungsi di bawah ini, (a) tentukan
the critical points (CP) dimana fungsi dinyatakan optimum, (b) tentukan
pula apakah CP tersebut fungsi adalah relative max/min, inflection atau sadle
point.
(a). Z=5x2-8x-2xy-6y+4y2+27
(b). Z=4x2+128x-12xy+96y+3y2+17
(c). Z=6x2-108x+4xy+12y-2y2-19
Selamat
Mengerjakan, Semoga Sukses!!!!
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