3х²-7х+4=0 -5х2+3х+2=0 9х²+5х-14=0 8х²+3х-11=0 Помогите срочно!!!

Вроде так.
А) 3х²-7х+4=0 D=b²-4ac
D=49 - 4*3*4 = 49 - 48 =1
x₁ = $\frac{-(-7) - √1}{2*3}$ x₁,₂= $\frac{-b+₋√D}{2*a}$
x₁ = $\frac{7 - 1}{6}$ = $\frac{6}{6}$ = 1
x₂ = $\frac{8}{6}$ = 1 $\frac{1}{3}$
Б) -5х2+3х+2=0
-10x + 3x + 2 =0
-7x = -2
7x = 2
x = $\frac{2}{7}$
В) 9х²+5х-14=0
D= 81 + 280 = 361
x₁= $\frac{-5 - √361}{2*9}$ = $\frac{-5-19}{18}$ = $\frac{-24}{18}$ = -1 $\frac{1}{3}$
x₂= $\frac{-5+19}{18}$ = $\frac{14}{18}$ = $\frac{7}{9}$
Г) 8х²+3х-11=0
D= 64 + 132 = 196
x₁= $\frac{-3-14}{2*8}$ = $\frac{-17}{16}$ = -1 $\frac{1}{16}$
x₂= $\frac{-3+14}{16}$ = $\frac{11}{16}$
Ответ: А)1; 1 $\frac{1}{3}$ Б) $\frac{2}{7}$ В)-1 $\frac{1}{3}$ Г) -1 $\frac{1}{16}$ ; $\frac{11}{16}$