Question

$x^{2}$+2x-3=0

Answer 1

x^2 + 2x - 3 = 0

D = b^2-4ac = 2^2 - 4*1*(-3) = 4 + 12 = 16

VD = V16 = 4

           -2+4                2

x1 = ------------- = --------- = 1

              2                   2

 

             -2-4                 -6

x2 = -------------- = ----------- = -3

               2                     2

 

 

ответ: x = -3 i x = 1

 

 

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