Here's the question you clicked on:
evergirl
Rationalize the denominator of ..........
\[\frac{ 4 }{ 2+7i }*\frac{ 2-7i }{ 2-7i }\] \[\frac{ 8-28i }{ ? }\] can you try to do the denominator
what did you get?... :D
the numerator is = 4(2-7i) = 8-28i yes or no? next the denominator is = (2+7i)(2-7i)= ______________?
if we have (a+b)(a-b)=a^2-b^2 also if we have (a+bi)(a-bi)=[a^2-(bi]^2 did you get this one ? yes or no?... :D
@ evergirl what did you get?