Question 1064080
NOTE:  a,b,c,d are real values.
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Multiplying is straightforward.  You just use the distributive property (aka FOIL) of binomials:   {{{ (a+bi)(c+di) = ac + adi + bci + bdi^2  = (ac-bd) + (ad+bc)i }}}   


Dividing is a bit more work.  One first multiplies the top and bottom by the complex conjugate of the denominator to get a denominator that is a real number:

{{{ (a+bi)/(c+di) = ((a+bi)*(c-di))/((c+di)(c-di)) = ((ac+bd)+(bc-ad)i) / (c^2+d^2) }}}

Of course, when you have numbers for a,b,c,and d, you can carry out the arithmetic until you end up with a complex number A+Bi where A and B are real numbers.

I encourage you to practice using problems you might find in your text or problems you find online.  The process is not difficult but with practice it becomes even easier.