# i need help basic math, me forgot formula

Discussion in 'Homework Help' started by hkra, Jul 3, 2005.

1. ### hkra Thread Starter Member

Jul 3, 2005
18
0
50 + j282.6

the 80º how to find out? can anyone show me the formula and steps for scientific calculator to press?

or

50 + j471

the 84º how to find out? can anyone show me the formula and steps for scientific calculator to press?

urgently by.
hkra

2. ### hkra Thread Starter Member

Jul 3, 2005
18
0
i did with this formula

click on the screenshot i created

but my answer came out was 10 /_ 40.97˚

the correct answer is 36.8 ˚

also i using the formula on picture above but the below 2 my answer wasn't same to the below answer, why?

-

50 + j282.6

-

50 + j471

hope you can help me! i'll in exam sooner.

thanks alot!

3. ### hkra Thread Starter Member

Jul 3, 2005
18
0
thx for your help i can solved it

my other question is now

http://tinypic.com/6qfn9s.jpg

IR answer is: 2.31/20 = 120 /_ 0ºA

IY answer is: 2.31/22.36 and -120º+63.43 = 100 /_ -56.57ºA

TB answer is: 2.31/31.62 and +120º-18.43º = 70 /_ 101.57ºA

how come my answer is not same to the picture?

hope you can help me this question

thanks...

Jul 3, 2005
18
0

5. ### hkra Thread Starter Member

Jul 3, 2005
18
0
in the picture's question and answer come from the sire's book.

6. ### hkra Thread Starter Member

Jul 3, 2005
18
0
anyhow can you show your answer and formula? maybe it is correct too? thank you

7. ### hgmjr Moderator

Jan 28, 2005
9,030
214
Like JoeJester, I too got answers different from those shown in the three problems. The magnitudes in the answers I calculated were off by a factor of 10.

hgmjr

8. ### hkra Thread Starter Member

Jul 3, 2005
18
0
hgmjr,

what answer you got from there? can you show me the formula what you did calculated?

9. ### hkra Thread Starter Member

Jul 3, 2005
18
0
i really need all of yours opinion and suggestion. me too answer was different from the origin.

10. ### hkra Thread Starter Member

Jul 3, 2005
18
0
no no, those i wrote in the quote is my own answers. i'm not sure it is correct or not

only answers in the picture below is correct

http://tinypic.com/6qfn9s.jpg

how did you calculated out all of these answer? can you tell me what to press first and later on calculator step by step?

11. ### hkra Thread Starter Member

Jul 3, 2005
18
0
i try. thank you brother.

12. ### hkra Thread Starter Member

Jul 3, 2005
18
0
this one my answer same as yours. but what my problem is the answer i did from my sire's question is not same as what sire's answer.

e.g

e.g