Question

Resolva a equação:
X²+x-2=0

Answer 1

olá!

equação do 2° grau incompleta

x² + x - 2 = 0

x² + x = 2

usando a forma de Bhaskara :

x = -1 +-√ 1² - 4x1x(-2)

      --------------------------

                 2.1

x = - 1 +- √ 1 - 4 .1.( -2 )

   ------------------------------------

                  2.1

x = - 1 +- √1 - 4 . (- 2 )

     -------------------------------

              2.1

x = - 1 +-√ 1 - 4.( -2 ) 

    -------------------------------

                  2

x = - 1 +- √ 1 +8

    ---------------------

              2

x = - 1 +- √ 9

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             2

x = - 1+3                           x =   - 1 - 3

   ------------                             --------------

        2                                            2

x =  2                                   x =   - 1 - 3

   ---------                                    -----------

      2                                               2

x = 1                                   x =    - 4

                                                ------------

                                                       2

 x = 1                                  x =  - 2

s = { -2,1 }

bons estudos!