надо упростить x^2...

надо упростить x^2 +4x-21 / 2x^2+11x-21

 

x^2 +4x-21=0                           2x^2+11x-21=0
д=100=10^2                            д=289=17^2
x=(-4-+10)\2                              x= (-11-+17)\4=
x1=-7                                            x1= -7
x2=3                                               x2 =1.5
(x+7)(x-3)                                     (x+7)(x-1.5)
 
 
(x+7)(x-3)                           (x-3)
-------------                 =--------------------
(x+7)(x-1.5)                       (x-1.5)