Happy Story In High School
149. LEARN MATH
LEARN MATH
Dav suddenly became a teacher to his friends, which he taught to any friend who did not understand or understand, then he would be very happy to help.
Until the voice of Bu Livy became the center of attention of every student who was being taught by Dav and partly by Teguh and Edo.
" Okay, children, all the attention, you can return to your respective seats, mother will explain again the next material yes, yes, please take good care because after this mom will give you a task later and collected the day after understanding all." Obviously Miss Livy.
" Understand Mom." Answer them in unison.
All students again sit in their respective places and orderly, especially considering they will soon carry out the class examination that will be counted in the next 2 months, therefore they are serious in every subject in order to get satisfactory grades.
" Good for the next is Determinant Matrix Order 3x3. Suppose
determinant is a 3x3-order matrix. There are two ways that can be done to find the determinant, namely using the Sarrus rule and the minor-cofactor method.
determinant formula of order matrix 3x3.
Examples of matrix determinants
Determine the following matrix determinants using the Sarrus rule and the minor-cofactor method!
Examples of matrix determinants
Determine the following matrix determinants using the Sarrus rule and the minor-cofactor method!
Discussion:
• The Sarrus Rules
Discussion:
Then, we draw a dotted line like the picture above. Multiply the elements affected by the dotted line. The result of the element that is exposed to the blue dotted line is given a positive sign (+), while the result of the element that is exposed to the orange dotted line is given a negative sign (-). Remember the order of writing, too.
• Minor-Cofactor Method
Based on the minor-cofactor formula above, the determinant of matrix A can be searched by calculating the sum of all the times between the cofactor of the matrix part of matrix A and the elements in one row or column of matrix A. So, first, we select one of the rows or columns of matrix A to get its determinant value. For example, we select the 1st line. The 1st row matrix elements are a11, a12, and a13.
Furthermore, since we select the elements in row 1, the determinant matrix formula we use is as follows:
Step two, we find the cofactor matrix part of matrix A (Cij). Cij \= (-1)i+j Mij and Mij \= det Aij with Aij is a part matrix of matrix A obtained by omitting the ith row and the j-column. Meaning how? Okay, so take a good look.
Previously, we had selected the elements in line 1, namely a11, a12, and a13. Therefore, the matrix parts of its matrix A are A11, A12, and A13.
Ms. Livy explained very detailed every part that was difficult to understand by her students, but there were also some of her students who had responded immediately.
Crazy ni Bu Livy if you feel the fairy talein sleeping child make me drowsiness njir.
Tere had been yawning to hold back the sleepiness when Bu Livy explained some of the subject matter described in front of the blackboard.
" It is good for children because soon the hours of rest then our material will continue the day after tomorrow, the mother will also give a task for the Determinant formula of the Order Matrix of 2x2, the, because for this one it is a little complicated, therefore mother will give this task alone." Obviously Miss Livy.
" Good Mom."
They went back to listening to the subject matter given by Ms. Livy until the break even rang.
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