Помогите решить. Срочно

Question

Помогите решить. Срочно

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Answer 1

1) 6x + 18 = 0
    6x = -18
    x = -3
2) -4x + 4 = -6
    -4x = -10
    x = 2.5
3) -2x + 3 = -8x
    -2x + 8x = -3
    6x = -3
    x = -0.5
4) 3 - 4x = 4x - 5
    -4x - 4x = -3 - 5
    -8x = -8
    x = 1
5) 7(-3 + 2x) = -6x - 1
     -21 + 14x = -6x - 1
     14x + 6x = 21 - 1
     20x = 20
     x = 1
6) x^2 - 3x - 40 = 0
    D = 9 + 160 = 169
    x1 = (3+13)/2 = 8
    x2 = (3-13)/2 = -5
7) x^2 + 11x + 24 = 0
    D = 121 - 96 = 25
    x1 = (-11+5)/2 = -3
    x2 = (-11-5)/2 = -8
8) x^2 = -x + 20
    x^2 + x - 20 = 0
    D = 1 + 80 = 81
    x1 = (-1 + 9)/2 = 4
    x2 = (-1 - 9)/2 = -5
9) x^2 = 7x + 18
    x^2 - 7x - 18 = 0
    D = 49 + 72 = 121
    x1 = (7 + 11)/2 = 9
    x2 = (7 - 11)/2 = -2
10) x^2 - 20x = -5x -13 - x^2
      x^2 + x^2 - 20x + 5x +13 = 0
      2x^2 - 15x + 13 =0
      D = 225 - 104 = 121
      x1 = (15 + 11) / 4 = 6.5
      x2 = (15 - 11) / 4 = 1

Answer 2

1)6x+18=0
6x=-18
x=-3
2)-4x+4=-6
-4x=-10
x=2.5
3)-2x+3=-8x
-2x+8x=-3
6x=-3
x=-2
4) 3-4x=4x-5
-4x-4x=-3-5
-8x=-8
x=1
5) 7(-3+2x)=-6x-1
-21+14x=-6x-1
14x+6x=21-1
20x=20
x=1
6)x^2-3x-40=0
D=b^2-4ac=9+40*4*1=13^2
x=3+-13/2
x1= 8, x2=5
7)x2+11+24=0
D=121-24*4*1=25
x1=-11+5/2=-3 x2=-11-5/2=8
9)x^2=7x+18=x^2-7x-18=0
D=49+72=121=11^2
x1=7-11/2=-2 x2=7+11/2=9
8)x2=-x+20=x^2+x-20=0
D=1+20*4=81=9^2
x1=1+9/2=5 x2=1-9/2=-8
10) x2-20x=-5x-13-x^2=2x-15x+13=0
D=625+13*2*4=27^2
x1=15-27/4=-3 x2=15+27/4=10.5