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Mathematics 19 Online
zarkam21:

Help please on this

zarkam21:

1 attachment
satellite73:

is that \(\large i^{19}\)?

satellite73:

if so the answer is \(-i\)

satellite73:

4 goes in to 19 4 times with a remainder of 3, so \(i^{19}=i^3=-i\)

satellite73:

i can't read 12

zarkam21:

Hey

zarkam21:

I'm back

zarkam21:

@satellite73

zarkam21:

10 is i^19 11 is I^97

zarkam21:

@satellite73

zarkam21:

@Nnesha

Nnesha:

|dw:1489086876838:dw| 4 steps and then after i^4 it repeats the same pattern again i=i^5 i^2=i^6 to find the value of i to the larger number you just have to find the remainder of \[\large\rm \frac{ whatever~power }{ 4 } = i^{remainder}\]

Nnesha:

\\[i^2=\sqrt{-1} \cdot \sqrt{-1} = -1\]\[i^3=\color{red}{i^2} \cdot i = \color{Red}{(-1)} i =-i\]\[i^4 = i^2 \cdot i^2 = (-1)(-1)=1\]

Nnesha:

\

zarkam21:

Okay so 10 would be?

Nnesha:

hmm latex doesn't work for i =i= sqrt{-1} **

Nnesha:

divide 10 by 4 ( how many times doe 4 go into 10 what will be the remainder ?

zarkam21:

2.5

Nnesha:

4 times 1=4 4 times 2=8 4 times 3=12 (12 is bigger than 10) so we don't add this) 4 times 2=8 (4 goes into 10 2 times ) and the remainder will be 10-8=2 therefore we got i^2 which is ?

zarkam21:

what you wrote above right?

zarkam21:

like what you wrote for I^2

zarkam21:

can we please hurry I have 10 mins

Nnesha:

any doubt ?

zarkam21:

NO doubt but is that the answer for 10?

Nnesha:

to find i^10 divide 10/4 and then set i^(remainder) and then simplify remainder is 2 so i^2 now simplify

zarkam21:

so I ^19 would be

zarkam21:

no no we have to find I^19

Nnesha:

okay... do the same thing..

zarkam21:

So um divide right

Nnesha:

yes

zarkam21:

19 by 4?

Nnesha:

yes right because its a 4 steps cycle i've posted above

zarkam21:

I got 4.75

Nnesha:

oky so what is the remainder

zarkam21:

.75?

Nnesha:

no calculator will not give you the remainder 19/4= 4.75 the number before decimal represent how many times 4 goes into 19 what's what is 4 times 4 = ?? subtract that from the power(19) that will be the remainder

zarkam21:

4*4 is 16

zarkam21:

19-16=3

Nnesha:

yes right so what will be the answer ?

zarkam21:

I^3

Nnesha:

yes right what i^3 equal to what ?

zarkam21:

what you have written above right?

Nnesha:

yes

zarkam21:

Is that the final answer then

Nnesha:

yes

zarkam21:

okay what about I^97

Nnesha:

same thing

zarkam21:

Okay so 97/4

Nnesha:

yes

zarkam21:

which is 24.25

zarkam21:

so 97-16?

Nnesha:

what is 16 ??

zarkam21:

isn't it 4*4

Nnesha:

[24].25 all the numbers before decimal

zarkam21:

ohh so 97-24?

Nnesha:

hmm no multiply that by 4

zarkam21:

96

zarkam21:

so I^1

Nnesha:

yes.

zarkam21:

is it the power of -1?

Nnesha:

i^1 is same as i

zarkam21:

so that would be?

Nnesha:

|dw:1489089100439:dw|

zarkam21:

I just need help with 2 more questions if you don't mind :/

Nnesha:

depends on the question is it same as this >

zarkam21:

1 attachment
Nnesha:

|dw:1489089240841:dw|

zarkam21:

Okay did that and then

zarkam21:

fast please meri behn

zarkam21:

-15?

Nnesha:

|dw:1489089520879:dw| now add the number in the column

zarkam21:

-16

Nnesha:

hmm wait 1 is not negative

zarkam21:

-14?

Nnesha:

|dw:1489089593807:dw| now repeat the same steps multiply -14 by -3 and write that above the line in 3rd column

zarkam21:

42

Nnesha:

yep

zarkam21:

is that the x ?

Nnesha:

|dw:1489089684112:dw|

Nnesha:

yes

zarkam21:

Okay next problem =)

zarkam21:

SO number 15 is x=42 right?

Nnesha:

yes

zarkam21:

OKay next problem

Nnesha:

its the same thing just backwards remember we multiplied *some numbers * with first number in order to find the number for second column |dw:1489089823547:dw|

Nnesha:

*some number ***

zarkam21:

So 20?

Nnesha:

|dw:1489089995843:dw| that's how for the first question there is -3 |dw:1489090038390:dw|

Nnesha:

what's 20 ?

zarkam21:

Oh -3?

Nnesha:

yes but remember that's an example like for #15 how would we find |dw:1489090202991:dw| this number if it wasn't given

Nnesha:

now do the same thing for #16

zarkam21:

4/2

Nnesha:

yes.

zarkam21:

So x would equal 2?

Nnesha:

yes

zarkam21:

Thank you so much that is all

Nnesha:

yw

Allison:

If this question has been answered, please close it. Thank you! :)

Eiwoh2:

@zarkam21

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