anonymous
  • anonymous
If 3+2i is a solution for x^2+mx+n , where m and n are real numbers, what is the value of m?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
easier than you think
anonymous
  • anonymous
if \(3+2i\) is a zero so is \(3-2i\) the quadratic factors as \[(x-(3+2i))(x-(3-2i))\] when you multiply out you will get \(x^2\) as the first term last term \(n\) will be \(3+2i)(3-2i)=3^2+2^2=14\)and the "middle term" will be\[-(3+2i)x-(3-2i)x=-6x\]
anonymous
  • anonymous
actually \(3^2+2^2=13\) but whatever

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anonymous
  • anonymous
the original quadratic was \[x^2-6x+13\]
anonymous
  • anonymous
m should be -6
anonymous
  • anonymous
once you see this you can know if \(a+bi\) is a zero, s is \(a-bi\) and the original quadratic is \[x^2-2ax+a^2+b^2\]
anonymous
  • anonymous
btw you can always work backwards: \[x=3+2i\] \[x-3=-2i\] \[(x-3)^2=(-2i)^2=-4\] \[(x-3)^2+4=0\] \[x^2-6x+9+4=0\]
anonymous
  • anonymous
okay so how do I get the value of m from there?
anonymous
  • anonymous
\[x^2+mx+n=0\] \[x^2-6x+13=0\] what is \(m\)?
anonymous
  • anonymous
the original question asked for the value of m
anonymous
  • anonymous
so m is -6?
anonymous
  • anonymous
Thanks!!
anonymous
  • anonymous
\[\Large(3+2i)^2+m(3+2i)+n=0\] \[\Large 9+12i+4i^2+3m+2 mi+n=0\] \[\Large (3m+n)+ 2mi=-12i-5\] \[\Large 3m+n=-5 \\2m=-12\\m=-6\\n=13\]

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