anonymous
  • anonymous
find the complx? 12+5i
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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amistre64
  • amistre64
find it?
anonymous
  • anonymous
complex what? part? if complex part of the number - it's number in a front of i, so complex part=5
amistre64
  • amistre64
real + imaginary maybe? 12 + 5i ; 5i is the imaginary part

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anonymous
  • anonymous
right!
anonymous
  • anonymous
first we can find the modulus. and the find . Arg angle .. by using tan inverse (y\x)
anonymous
  • anonymous
confused... what is the actual problem?
amistre64
  • amistre64
teh modulus is the length of the line right? sqrt(144+25) = 13
amistre64
  • amistre64
the angle is that of tan^-1(5/12) i spose
amistre64
  • amistre64
if we plot this on reals; it would look like (12,5)
anonymous
  • anonymous
its right. but agter we can use formula. r(cos angle + i sin angle)
amistre64
  • amistre64
r(cos(t) + i sin(t)) is the polar coordinates...yes :) where r = 13 and t = that angle of tan^-1(5/12)
amistre64
  • amistre64
t = 22.62 or so...
anonymous
  • anonymous
is the ans 119
anonymous
  • anonymous
how which formula to use? to find
anonymous
  • anonymous
do (12+5i)(12-5i) 144-25[i^{2}\] 169 is the ans

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