Question 862188
<pre>



{{{7-i/3-4i}}}

{{{7 - (1/3+4)i}}}

{{{7 - (4&1/3)i}}}

{{{7-(13/3)i}}}

Modulus = {{{sqrt(7^2+(-13/3)^2)}}} = {{{sqrt(49+169/9)}}} = {{{sqrt((441+169)/9)}}} = {{{sqrt(610/9)}}} = {{{sqrt(610)/3}}}

Argument = tan<sup>-1</sup>{{{(-13/3)/7}}} = tan<sup>-1</sup>{{{(-13/3)*(-1/7)}}} = tan<sup>-1</sup>{{{(-13/21)}}}

This is a fourth quadrant angle since (7,{{{-13/3)}}}) is in the fourth 
quadrant, so the argument is approximately 328.2° or -.554 radians. 

Edwin</pre>