## anonymous 4 years ago I need help with LU factorization

1. anonymous

|dw:1328685001683:dw|

2. anonymous

are so saying, how to simplify this and find the discriminant?

3. anonymous

matrix problem right?

4. anonymous

umm no A=LU the matrix A = to the lower traingle matrix multiplies by the upper triangle matrix

5. anonymous

LU?

6. anonymous

L=lower triangle matrix U= uppertriangle matrix

7. anonymous

|dw:1328686708737:dw|

8. anonymous

you are welcome . first one lower .. second one upper...

9. anonymous

Yay thanks waleed :D

10. anonymous

thnx for medal ... the smartest . cute est ... humblest :P

11. anonymous

hehe the prettiest

12. anonymous

miltiply |dw:1328686872400:dw| minus|dw:1328686938018:dw|. is this the process you've made waleed kha?

13. anonymous

No.

14. anonymous

That is to find the determinanat

15. anonymous

wanna to explain it ?

16. anonymous

plz explain :D

17. anonymous

first row by first column. must be equal the first no in given Matrix

18. anonymous

|dw:1328687221393:dw|

19. anonymous

|dw:1328687327575:dw| 2 times 1 + zero + zero = 2 same as give matrix

20. anonymous

|dw:1328687391301:dw| 2 times 0.5 + zero times x + zero = 1

21. anonymous

|dw:1328687471716:dw| 2 times 2 + zero times x + zero times y = 4 dont worry for x and y .. we just show that we dont care for its value.

22. anonymous

do you have any attachment that i could refer to?

23. anonymous
24. anonymous

|dw:1328687756969:dw| -1 times 1 + zero + zero = -1

25. anonymous

|dw:1328687791184:dw| -1 times 0.5 + 4.5 times 1 = 4 here it is i mistake in my answer up in first replay.

26. anonymous

|dw:1328687926717:dw| $\huge {-1 \times 4 + 4.5\times x= -2}$ $x= \frac {1}{2.25}$

27. anonymous

I never learnt this method

28. anonymous

|dw:1328688188380:dw| as long as the answer should be zero

29. anonymous

|dw:1328688226631:dw| zero times 0.5 + 5 times 1 + unknown times zero = 5

30. anonymous

|dw:1328688305904:dw| solve for x y zero times 4 + 5 times 1/2.25 + x times y = 2 x times y = 1/4.5 let x = 1 y = 1/4.5

31. anonymous

This is it . . its simple, hope you get it . thnx for your listening time

32. anonymous

lol thank you :D