Question

find the complx? 12+5i

Answer 1

find it?

Answer 2

complex what? part? if complex part of the number - it's number in a front of i, so complex part=5

Answer 3

real + imaginary maybe?

12 + 5i ; 5i is the imaginary part

Answer 4

right!

Answer 5

first we can find the modulus.
and the find . Arg angle .. by using tan inverse (y\x)

Answer 6

confused... what is the actual problem?

Answer 7

teh modulus is the length of the line right? sqrt(144+25) = 13

Answer 8

the angle is that of tan^-1(5/12) i spose

Answer 9

if we plot this on reals; it would look like (12,5)

Answer 10

its right. but agter we can use formula.
r(cos angle + i sin angle)

Answer 11

r(cos(t) + i sin(t)) is the polar coordinates...yes :) where r = 13 and t = that angle of tan^-1(5/12)

Answer 12

t = 22.62 or so...

Answer 13

is the ans 119

Answer 14

how which formula to use?
to find

Answer 15

do (12+5i)(12-5i)
144-25[i^{2}\]
169 is the ans