anonymous
  • anonymous
a polynomial has one root that equals 2 + i. What is one other root of this polynomial?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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ybarrap
  • ybarrap
complex roots come in pairs - one the conjugate of the other
anonymous
  • anonymous
It is 2-i which is the conjugate of 2+i. Complex roots comes in pairs (conjugate of each other). If one of them is a+bi then the other is a-bi
ybarrap
  • ybarrap
does this make sense?

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anonymous
  • anonymous
oh right! kinda like the inverse
ybarrap
  • ybarrap
Yes! But rather than testing vertically to check for more that one y-value for each x in the case of functions, you test horizontally to see if there is more than one x-value for the same y-value in the case of inverses. These are the vertical test and the horizontal test for functions and inverses, respectively. You got it!

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