anonymous
  • anonymous
How many sign changes are in the polynomial f(x) = 3x3 - 7x2 - 9x + 1
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
\[+3x ^{3} - 7x ^{2} - 9x + 1\] Therefore, there would be 3 sign changes.
anonymous
  • anonymous
2 I mean
anonymous
  • anonymous
how would did you do that

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anonymous
  • anonymous
|dw:1435260258282:dw|
anonymous
  • anonymous
It goes + - - + So you start at + and go to -, that is one sign change. Then - to -, that is the same so no sign change. Finally - to + which is a sign change therefore you have 2 sign changes.

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