1х2^+2х-15=02х2^-5х-14=03х2^+3х-18=0

1 Январь 0001



1)х2^+2х-15=0
2)х2^-5х-14=0
3)х2^+3х-18=0

  • 1) X^2 + 2X – 15 = 0

    D = 4 – 4*1(-15) = 64   V D = 8

    X1 = -2 + 8 2 = 62 = 3

    X2 = – 2-82 = -102 = – 5

    ……………………….

    2) X^2 – 5X – 14 = 0

    D = 25 -4*1*(-14) = 25 + 56 = 81  V D = 9

    X1 = 5 + 9 2 = 14 2 = 7

    X2 = 5 – 9 2 = – 4 2 = – 2

    ……………………………..

    3) X^2 + 3X – 18 = 0

    D = 9 – 4*1*(-18) = 9 + 72 = 81

    X1 = – 3 + 9 2 = 62 = 3

    X2 = – 3 – 9 2 = – 122 = -6

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     









Алгебра

Комментарии закрыты.