Question

Qual a resolução da seguinte equação :

x² + 9 x + 8 = 0

Answer 1

A=1 B=9 C=8

Formula Discriminante  Δ=b² - 4 * a * c

Δ= 9² - 4 * 1 * 8
Δ= 81 - 32
Δ= 49

                                       -b +/- √Δ
Formula Bhaskara X =    ----------
                                          2*a


       -9 +/- √49
x =  -------------
         2*1

           -9 +/- 7
x=     ------------
                2

          -9 + 7                        -9 - 7
x' = -------------          x'' = --------------
              2                                2


          -2                               -16
x'= ----------                  x'' = --------
           2                                  2

x' = -1                         x''= -8

espero ter ajudado