A = | 1 2 |

3 4

b = | 1 3 |

5 7

a* b = ?

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- Jan 19th 2010, 12:56 PMranjitbdmultiplication of two matrix
A = | 1 2 |

3 4

b = | 1 3 |

5 7

a* b = ? - Jan 19th 2010, 12:58 PMKrizalid
- Jan 19th 2010, 01:39 PMSoroban
Hello, ranjitbd!

If you know how to multiply matrices, exactly where is your difficulty?

If you don't know how, this is not the place to learn it.

Quote:

Gtiven: .$\displaystyle A \:=\:\begin{vmatrix} 1&2 \\ 3&4 \end{vmatrix} \qquad B \:=\:\begin{vmatrix}1&3\\5&7 \end{vmatrix}$

Find: .$\displaystyle A\cdot B$

$\displaystyle A\cdot B \;=\;\begin{vmatrix}1&2\\3&4\end{vmatrix}\, \begin{vmatrix}1&3\\5&7\end{vmatrix}$ .$\displaystyle = \;\begin{vmatrix}(1)(1)+(2)(5) & (1)(3)+(2)(7) \\ (3)(1)+(4)(5) & (3)(3)+(4)(7)\end{vmatrix} \;=\;\begin{vmatrix}11 & 17 \\ 23 & 37 \end{vmatrix}$

- Jan 19th 2010, 01:48 PMranjitbdexample of a matrix multiplication
- Jan 19th 2010, 01:53 PMranjitbdreally thanks...