2х(в квадрате) -3х-14=0, через дискриминант поиогите пожалуйста! буду благодарна!

2х"2-3х-14=0 Д=9+112=121 х1=3+11/4=3.5 х2=3-11/4=-2     \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

2x^2-3x-14=o D=b^2-4ac=(-3)-4*2*(-14)=9+112=121>0, 2 корня x1= -b+√D = 3+11 =  14 = 7 = 3.5             2a        2*2         4     2 x2= -b-√D = 3-11 = -8 = -2           2a          4        4  или вот так можно(быстрее и проще) 2x^2-3x-14=0 (2x-7)(x+2)=0 2x-7=0 или x+2=0  2x=7              x=-2 x=3.5