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)

^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)