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jay11355 jay11355
  • 01-02-2016
  • Mathematics
Answered

find the roots of the polynomial equation -x^3+5x^2 - 11x+55=0

Verified Answer :

Panoyin
Panoyin Panoyin
  • 01-02-2016

x³ + 5x² - 11x + 55 = 0
x²(x) + x²(5) - 11(x) - 11(5) = 0
          (x²(x + 5) - 11(x + 5) = 0
                   (x² - 11)(x + 5) = 0
x² - 11 = 0       or        x + 5 = 0
   + 11 + 11                    - 5  - 5
       x² = 11         or          x = -5
        x = ±√(11)      or      x = -5

THere are three roots in the polynomial equation.

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