anonymous
  • anonymous
If f(x) = x3 – 2x2, which expression is equivalent to f(i)?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
–2 + i –2 – i 2 + i 2 – I My choices
amoodarya
  • amoodarya
\[i=\sqrt{-1}\\i^2=-1\\i^3=i^2i=-i\\i^4=(i^2)^2=(-1)^2=1\\\]
amoodarya
  • amoodarya
\[f(i)=i^3-2i^2=\\i^2i-2(-1)\]

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amoodarya
  • amoodarya
can you go on ?
anonymous
  • anonymous
No, I honestly don't understand this section on complex number I've been working on the same quiz since 8:00
amoodarya
  • amoodarya
you can replace i^3 by -i and i^2=-1 put in function let me see your work
amoodarya
  • amoodarya
where are you ?

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