Under the section of complex number, i faced 2 questions which i couldn't answer... Here they go...
-Show that x=1-2i is a root of the equation x3-3x2+7x-5=0. Hence, find all the roots of the equation.
-Express http://img832.imageshack.us/img832/7916/msp180019e92f47ie4d5afg.gif [Broken] in the form a+ib, where a>0.
for both question, ''i'' represents imaginary number
The Attempt at a Solution
I tried both for hour but couldn't solve them...
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