Помогите пожалуйста оч надо

1). 100/(x+2) - 17 = 7x
ОДЗ : x не равен (-2).
100 - 17(x+2) = 7x(x+2)
100-17x-34 = 7x^2 + 14x
7x^2 + 31x - 66 = 0
D = 31^2 + 4*7*66 =
961 + 1848 = 2809
x1 = (-31+53)/2*7 =
22/14 = 11/7
x2 = (-31-53)/14 = -84/14 =
-6
2). -x - 36/(x+5) = -8
ОДЗ : x не равен (-5).
-x(x+5) - 36 = -8(x+5)
x^2 - 3x - 4 = 0
D = 9 + 4*4 = 25
x1 = (3+5)/2 = 4
x2 = (3-5)/2 = -1
3). -x^2 - 6x - 5 = 0
x^2 + 6x + 5 = 0
D = 36 - 4*5 = 16
x1 = (-6+4)/2 = -1
x2 = (-6-4)/2 = -5
4). x^2 + 2x - 3 = 0
D = 4 + 4*3 = 16
x1 = (-2+4)/2 = 1
x2 = (-2-4)/2 = -3
5). -x^2 - 8x - 15 = 0
x^2 + 8x + 15 = 0
D = 64 - 4*15 = 4
x1 = (-8+2)/2 = -3
x2 = (-8-2)/2 = -5

1) - Е (-6; 11/7)
2) - Б (4;-1)
3) - А (-3;1)
4) - С (-3;-5)

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