# i need help basic math, me forgot formula

#### hkra

Joined Jul 3, 2005
18
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

#### hkra

Joined Jul 3, 2005
18
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!

#### hkra

Joined Jul 3, 2005
18
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...

#### hkra

Joined Jul 3, 2005
18

#### hkra

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

#### hkra

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

#### hgmjr

Joined Jan 28, 2005
9,027
Originally posted by JoeJester@Jul 5 2005, 06:17 PM
my answers don't agree with sire's book.
[post=8923]Quoted post[/post]​
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

#### hkra

Joined Jul 3, 2005
18
hgmjr,

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

#### hkra

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

#### hkra

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

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
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?

#### hkra

Joined Jul 3, 2005
18

#### hkra

Joined Jul 3, 2005
18
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