TOLONG DIKERJAKAN BBESERTA CARANYA BIAR SAYA BISA.... Question from @MuhammadNurHabibi

September 2018 1 18 Report

TOLONG DIKERJAKAN BBESERTA CARANYA BIAR SAYA BISA

$D1:\\ A= \left[\begin{array}{cc}-1&6&8&-5\\\end{array}\right] C= \left[\begin{array}{cc}4&1&2&3\\\end{array}\right] AB-C= \left[\begin{array}{cc}12&7&-1&-24\\\end{array}\right]\\ tentukan nilai B ?\\$

Iwan47 Misal $B = \left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right]$

AB - C = $\left[\begin{array}{ccc}-1&6\\8&-5&\\\end{array}\right] \left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right] - \left[\begin{array}{ccc}4&1&\\2&3&\\\end{array}\right]$

$\left[\begin{array}{ccc}-a + 6c&-b + 6d\\8a - 5c&8b - 5d\\\end{array}\right] - \left[\begin{array}{ccc}4&1\\2&3\\\end{array}\right]$

$\left[\begin{array}{ccc}-a + 6c - 4&-b + 6d - 1\\8a - 5c - 2&8b - 5d - 3\\\end{array}\right] = \left[\begin{array}{ccc}12&7\\-1&-24\\\end{array}\right]$

-a + 6c - 4 = 12
-a + 6c = 12 + 4
-a + 6c = 16 ---> a = 6c - 16

8a - 5c - 2 = -1
8a - 5c = -1 + 2
8a - 5c = 1 (subtitusikan)
8(6c - 16) - 5c = 1
48c - 128 - 5c = -1
48c - 5c = 128 - 1
43c = 127
c = 127/43

a = 6c - 16
a = 6(127/43)
a = 762/43

-b + 6d - 1 = 7
-b + 6d = 7 + 1
-b + 6d = 8 ------> b = 6d - 8

8b - 5d - 3 = -24
8b - 5d = -24 + 3
8b - 5d = - 21 (subtitusikan)
8(6d - 8) - 5d = -21
48d - 64 - 5d = -21
48 - 5d = -21 + 64
43d = 43
d = 43/43
d = 1

b = 6d - 8
b = 6(1) - 8
b = 6 - 8
b = -2

$B = \left[\begin{array}{ccc} \frac{726}{43}&-2\\ \frac{127}{43} &1\\\end{array}\right]$

Diketahui fungsi f(x) = 3x – 1 dan g(x) = 2xpangkat2– 3. Komposisi fungsi ( g ° f) (x)

Answer

Diketahui fungsi f(x) = 3x – 1 dan g(x) = 2xpangkat2– 3. Komposisi fungsi ( g ° f) (x)

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