Решить тренажер по математике "Квадратные уравнения"

4x^2-5x-4 = 0
D = 25 + 64 = 89
x1 = 5+V89/8
x2 = 5-V89/8

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16x^2 - 8x + 1 = 0
(4x-1)^2 = 0
4x - 1 = 0
4x = 1
x = 1/4

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14x^2 - 5x - 1 = 0
D = 25 + 56 = 81
x1 = 5+9/28 = 14/28 = 1/2
x2 = 5-9/28 = -4/28 = -1/7

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4x^2+x+67 = 0
D = 1 - 1072 = -1071
Нет решений

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4x^2 -12x + 9 = 0
D = 144 - 144 = 0
x = 12/8 = 3/2 = 1 1/2

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2x^2 - 2 = 3x
2x^2 - 3x - 2 = 0
D = 9+16 = 25
x1 = 3+5/4 = 2
x2 = 3-5/4 = -1/2

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-5x^2 = 9x-2
-5x^2 - 9x + 2 = 0
5x^2 + 9x - 2 = 0
D = 81 + 40 = 121
x1 = -9+11/10 = 1/5
x2 = -9-11/10 = -2

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5x^2 - x - 1 = 0
D = 1 + 20 = 21
x1 = 1+V21/10
x2 = 1-V21/10

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3x^2 + 5x = 0
x(3x+5)=0
x1 = 0
3x+5 = 0
3x = -5
x2 = -1 2/3

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19x-x^2 = 0
x(19-x) = 0
x1 = 0
19-x = 0
x2 = 19

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-7x^2+13 = 0
7x^2-13 = 0
7x^2 = 13
x^2 = 13/7
x^2 = 1 6/7
x1 = V(1 6/7)
x2 = -V(1 6/7)

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15x^2 = 0
x = 0

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0,5x^2 - 72 = 0
x^2 - 144 = 0
(x-12)(x+12) = 0
x1 = 12
x2 = -12

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(2x-1)(x+4) = x(3x+11)
2x^2 - x + 8x - 4 = 3x^2 + 11x
-x^2 - 4x - 4 = 0
x^2 + 4x + 4 = 0
D = 16 - 16 = 0
x = -4/2 = -2

Это не обязательное задание. Тренируйся сам.

Через дискриминант
d=b^2-4*a*c
потом корни уровнения
x1=-b+√ d /2a
x2=-d-√ d /2a

Помогите решить