anonymous
  • anonymous
Write -2i + (9 − 3i) − (6 − 10i) as a complex number in standard form. 3 − 5i 3 + 5i 3 + 16i 12 − 16i
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
can you help @Nnesha and @sohailiftikhar
Nnesha
  • Nnesha
first of all distribute 2nd parentheses by negative one
Nnesha
  • Nnesha
|dw:1438709754483:dw| -1(6-10i) distribute

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More answers

anonymous
  • anonymous
-6+10i
sohailiftikhar
  • sohailiftikhar
it's 3+5i
Nnesha
  • Nnesha
yep right now combine *like terms \[\huge\rm -2i+9-3i -6+10i\]
anonymous
  • anonymous
but if i was to distribute to the first part both numbers would be imaginary
anonymous
  • anonymous
3+5i
Nnesha
  • Nnesha
do you mean first parentheses ?
anonymous
  • anonymous
yeah
Nnesha
  • Nnesha
there is a plus sign so you don't have to distribute just remove the parentheses
sohailiftikhar
  • sohailiftikhar
\[-2i-3i+10i+9-6=3i+5\]
sohailiftikhar
  • sohailiftikhar
you just have to add or subtract like numbers only
anonymous
  • anonymous
|dw:1438709987964:dw| was how they showed me
anonymous
  • anonymous
that was the example they gave me
anonymous
  • anonymous
can you help with this problem as well? Write (21 − 4i) − (16 + 7i) + 28i as a complex number in standard form. 5 + 39i 5 + 17i 5 − 39i 5 − 17i
Nnesha
  • Nnesha
yep they shows what are like terms 3i and 5i are like terms so combine them add their coefficient (3+5)i = 8i
sohailiftikhar
  • sohailiftikhar
ok Nnesha you here
Nnesha
  • Nnesha
same like last one so what would be the first step ?
anonymous
  • anonymous
okay so this one i would combine right ?
Nnesha
  • Nnesha
nope that's 2nd step
Nnesha
  • Nnesha
\[ \huge\rm (21 − 4i) \color{ReD}{−} (16 + 7i) + 28i \] there is a negative sign so.?
sohailiftikhar
  • sohailiftikhar
lol it's not a level of child Nnesha
Nnesha
  • Nnesha
what do you mean by that ?
anonymous
  • anonymous
i would add a 1?
sohailiftikhar
  • sohailiftikhar
just combine the terms and get answer what is that mean by 1st step and 2nd ?
Nnesha
  • Nnesha
there are steps to solve any math questions
sohailiftikhar
  • sohailiftikhar
yes but we have to see where we need then or where we can directly
Nnesha
  • Nnesha
1st step) distribute parentheses by -1 2nd) combine like terms how would you combine them first without applying distributive property ?
anonymous
  • anonymous
21- 16 would be 5 and it would be subtraction after that right ?
sohailiftikhar
  • sohailiftikhar
so if you have given with a lengthy Question and then you will still use every basic step huh ?
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @sohailiftikhar just combine the terms and get answer what is that mean by 1st step and 2nd ? \(\color{blue}{\text{End of Quote}}\) first distribute parentheses
Nnesha
  • Nnesha
if you start with combining like terms you would get wrong answer
sohailiftikhar
  • sohailiftikhar
what if you are solving multiple choices and you have short time to do them huh ?
anonymous
  • anonymous
the last part would be 17 but is it negative ?
Nnesha
  • Nnesha
you can't get wright answer without doing first step.
sohailiftikhar
  • sohailiftikhar
not for this Question
Nnesha
  • Nnesha
right*
Nnesha
  • Nnesha
at this point we should focus on this question.
anonymous
  • anonymous
agreed ^
anonymous
  • anonymous
so it would be 5+17I right?
sohailiftikhar
  • sohailiftikhar
yes so it can solve by just adding terms
sohailiftikhar
  • sohailiftikhar
ok don't mind this bye
anonymous
  • anonymous
thanks again guys you've been a really big help!!!
sohailiftikhar
  • sohailiftikhar
no problem buddy
Nnesha
  • Nnesha
\(\color{blue}{\text{Originally Posted by}}\) @sohailiftikhar yes so it can solve by just adding terms \(\color{blue}{\text{End of Quote}}\) again first we have to distribute the parentheses
sohailiftikhar
  • sohailiftikhar
yes but we done this in our mind not on page because it's simple in this case

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