anonymous
  • anonymous
okay im back with more questions and more medals to give out nnesha is very good at helping ppl so if you have questions and shes on youll do wonderfully and that goes for jim but hes not one yet. okay back to the problem at hand. (-8+i) (-8-i) i got 64i - i bc i foiled btu they want this in standard form what did i do wrong?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
Nnesha
  • Nnesha
:P thanks haha :=)
Nnesha
  • Nnesha
show ur work plz :=)
anonymous
  • anonymous
your welcome! I hope you get many medals :) |dw:1441041648467:dw| |dw:1441041814049:dw|

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More answers

Nnesha
  • Nnesha
to foil two parentheses box method would be great/neat |dw:1441042176623:dw|i times -i = ??
Nnesha
  • Nnesha
when you multiply same bases you should `add` their exponents
anonymous
  • anonymous
okay i remember here is rule a while ago but i cant remember it that well.
Nnesha
  • Nnesha
alright so when we multiply same bases we should add their exponents \[\huge\rm x^m \times x^n=x^{m+n}\]
Nnesha
  • Nnesha
i is same as i to the one power so \[\huge\rm i^1 \times i^1=??\]
anonymous
  • anonymous
the thing i guess that is confusing me is the fact that my problem does not contain exponents. The i thing does sort of make sense.
Nnesha
  • Nnesha
no there is an exponent `invisible one`
Nnesha
  • Nnesha
i is same as i^1
anonymous
  • anonymous
okay
anonymous
  • anonymous
so my negative i should be squared then your suposed to take (-1) (-i) i^2
anonymous
  • anonymous
to make it with out its exponent
Nnesha
  • Nnesha
multiply i times i which is i^2 and i^2 =what ?
anonymous
  • anonymous
i?
Nnesha
  • Nnesha
\[\large\rm i=\sqrt{-1}~~~~~~~so~~i^2=?\]
anonymous
  • anonymous
so is it just -1? im still confused
Nnesha
  • Nnesha
yes right i^2=-1
Nnesha
  • Nnesha
you should remember 4 cycle of i \[\rm i=\sqrt{-1}\]\[\rm i^2=-1\] \[\rm i^3=-i\]\[\rm i^4=1\]
anonymous
  • anonymous
so the answer should be 63?
Nnesha
  • Nnesha
if you know that then you can find i^999
Nnesha
  • Nnesha
nope
anonymous
  • anonymous
i have no clue
Nnesha
  • Nnesha
it's |dw:1441043195360:dw| i times -1 forgot the negative
Nnesha
  • Nnesha
i times -i**
Nnesha
  • Nnesha
|dw:1441043278896:dw| i^2=-1 now distribute -(-1) then combine them
Nnesha
  • Nnesha
you gotta be careful about signs especially negative
anonymous
  • anonymous
so 64 -(-1) = 64+1 = 65
Nnesha
  • Nnesha
\(\huge\color{green}{\checkmark}\)
Nnesha
  • Nnesha
great job!
anonymous
  • anonymous
okay let me check it on my math lab
anonymous
  • anonymous
you rock!!
Nnesha
  • Nnesha
:=) i like to work with somone who `really` wants to learn not just waiting for the answer so great job!
anonymous
  • anonymous
thank you i used to be really good at math but since ive graduated its like ive lost almost everything but your refreshing my memory! (;
Nnesha
  • Nnesha
aww congrats! so are u going to take calculus one right ? good luck!
anonymous
  • anonymous
nope lol im not in calculus i wish i knew calculus it would give me an advantage im in a math prep for college and then im in an actual college class that will adventually teach us calculus.
anonymous
  • anonymous
at GGC
Nnesha
  • Nnesha
ohh okay
anonymous
  • anonymous
ill be on later im gonna attempt to work on some of these by my self now the foil with the i is still a bit confusing though.
anonymous
  • anonymous
the prob was (2+7i)^2 and they want me to use foil i got 4+77i which is not correct
Nnesha
  • Nnesha
(2+7i)^2 is same as (2+7i)(2+7i) now foil!
anonymous
  • anonymous
okay im gonna go step by step with how i got 4+77i
Nnesha
  • Nnesha
alright so plz show ur work :=)
anonymous
  • anonymous
|dw:1441044467368:dw|
Nnesha
  • Nnesha
|dw:1441044870538:dw|
anonymous
  • anonymous
okay so instead it is 4+28i+49 then i would add the 4+49 = 53+28i?
Nnesha
  • Nnesha
no it's \[\huge\rm 4+28i+49i^2=4+28i+49(-1)\] 49 is positive before u distribute by negative on
anonymous
  • anonymous
ah okay the signs get me again. then this should be -45+28i
Nnesha
  • Nnesha
looks good!
anonymous
  • anonymous
okay one moment
Nnesha
  • Nnesha
okay
anonymous
  • anonymous
your name proves you well you are definatly the human calculator (: it was correct
Nnesha
  • Nnesha
haha thanks for the compliment lol there are like 1000+ users who really good at math i'm just fine :3
anonymous
  • anonymous
Lol well your help has worked wonders i will talk to you again later. Thank you!!
Nnesha
  • Nnesha
okay :D
Nnesha
  • Nnesha
& my pleasure :=)

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