Question 765502
You need only one piece of advice: Multiply numerator and denominator of items (a) and (b) by the conjugate of the denominator.  Items (c) and (d) only use skills you have already learned so they are no chore.  You already can understand {{{(13/13)=1}}}.


This is what happens when you multiply a complex number by its conjugate:
{{{(a+bi)(a-bi)=a^2-(bi)^2=a^2-(i^2)(b^2)=a^2-(-1)b^2=a^2+b^2}}}
so in short,
{{{(a+bi)(a-bi)=a^2+b^2}}}