annameghan
annameghan annameghan
  • 03-10-2017
  • Mathematics
contestada

rationalize the denominator of (click photo)

rationalize the denominator of click photo class=

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liemonder liemonder
  • 03-10-2017
[tex]\frac{\sqrt{-49}}{(7-2i)-(4+9i)}=\\ \frac{\sqrt{-1*7*7}}{3-11i}=\\ \frac{7i}{3-11i}*\frac{3+11i}{3+11i}=\\ \frac{(7i)*(3+11i)}{3^2-(11i)^2}=\\ \frac{21i+77i^2}{9+121}=\\ \frac{21i-77}{130}=\\ \frac{-77+21i}{130}[/tex]

so it is the last option
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