anonymous
  • anonymous
How many roots does the polynomial function y=(x-8)(x+3)^2 have? A. 2 B. 3 C. 1 D. 4
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Let P(x) = 5x3 − 4x2 + 7x − 8. Then a root of that polynomial is 1 : P(1) = 5· 13 − 4· 12 + 7· 1 − 8 = 5 − 4 + 7 − 8 = 0. thats how u do it
anonymous
  • anonymous
but not the answer
anonymous
  • anonymous
Ok..

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welshfella
  • welshfella
this is a cubic equation ( x^3) and will have 3 roots
welshfella
  • welshfella
This is the Fundamental Theorem of Algebra.
anonymous
  • anonymous
its 2 so its A
welshfella
  • welshfella
- that's not strictly true because 3 is a double root (x +3)^2
anonymous
  • anonymous
im just telling you what it told me
welshfella
  • welshfella
yes ok

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