Respostas

2013-06-03T20:02:03-03:00

Formula de bascara.

 

Delta= b²-4ac

 

D= 9-4.1.2

 

D=9-8=1

 

-(b)+-1/2.a

 

3+-1/2

 

x'= 4/2=2

 

x"=2/2=1

 

R= As raízes são (1,2)

 

 

 

 

  • Usuário do Brainly
2013-06-03T20:04:23-03:00

Temos que:

 

\text{x}^2-3\text{x}+2=0

 

Desta maneira, obtemos:

 

\text{x}=\dfrac{-(-3)\pm\sqrt{(-3)^2-4\cdot1\cdot2}}{2}=\dfrac{3\pm1}{2}

 

Logo, as raízes são:

 

\text{x}'=\dfrac{3+1}{2}=2

 

\text{x}''=\dfrac{3-1}{2}=1