torrmike torrmike
  • 08-10-2018
  • Mathematics
contestada

Which of the following sets contain all roots of the polynomial

Which of the following sets contain all roots of the polynomial class=

Respuesta :

chisnau chisnau
  • 17-10-2018

All these given roots are contained in option C.

The given equation is :

[tex]9x^{3}+9x^{2}-4x-4=0[/tex]

[tex]9x^{2}(x+1)-4(x+1)=0[/tex]

[tex](9x^{2}-4)(x+1)=0[/tex]

[tex]9x^{2}-4=0,x+1=0[/tex]

[tex]x^{2}=\frac{4}{9},x=-1[/tex]

[tex]x=\frac{2}{3},x=-1[/tex]

Roots = [tex]-1,\frac{-2}{3} ,\frac{2}{3}[/tex]

Hence these lie in between [tex](\frac{-3}{2} ,\frac{3}{2})[/tex]


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