Daily Archives: October 11, 2017

TRIGONOMETRI : Perbandingan Sisi Trigonometri

Sumber : youtube[dot]com

MATRIKS : Perkalian Dua Matriks

\displaystyle 1.~~\text{Carilah}

\displaystyle A=\left[ \begin{matrix}    2 & 5  \\    0 & -4  \\    \end{matrix} \right],B=\left[ \begin{matrix}    -1 & 3  \\    4 & 2  \\    \end{matrix} \right],\text{ dan }C=\left[ \begin{matrix}    2  \\    3  \\    \end{matrix} \right]

\displaystyle \begin{array}{l}a.~~AC+BC\\b.~~~\left( A+B \right)C\\c.~~~Apakah\,AC+BC=(A+B)C?\end{array}

Jawab :

\displaystyle a.~~AC+BC

\displaystyle AC+BC=\left[ \begin{matrix}    2 & 5  \\    0 & -4  \\    \end{matrix} \right]\left[ \begin{matrix}    2  \\    3  \\    \end{matrix} \right]+\left[ \begin{matrix}    -1 & 3  \\    4 & 2  \\    \end{matrix} \right]\left[ \begin{matrix}    2  \\    3  \\    \end{matrix} \right]
\displaystyle =\left[ \begin{matrix}    4+15  \\    0-12  \\    \end{matrix} \right]+\left[ \begin{matrix}    -2+9  \\    8+6  \\    \end{matrix} \right]