Решите 100 2)x^2+7x-30=0 3)6x^2-x-1=0 4)4x^2-4x-3=0 5)2x^2-x-6=0 6)3x^2+4x-4=0 7)2x^2-2x-4=0 решите

2)x^2+7x-30=0
x1+x2=-7 U x1*x2=-30
x1=-10 U x2=3

3)6x^2-x-1=0
D=1+24=25
x1=(1-5)/12=-1/3
x2=(1+5)/12=1/2

4)4x^2-4x-3=0
D=16+48=64
x1=(4-8)/8=-0,5
x2=(4+8)/8=1,5

5)2x^2-x-6=0
D=1+48=49
x1=(1-7)/4=-1,5
x2=(1+7)/4=2

6)3x^2+4x-4=0
D=16+48=64
x1=(-4-8)/6=-2
x2=(-4+8)/6=2/3

7)2x^2-2x-4=0
D=4+32=36
x1=(2-6)/4=-1
x2=(2+6)/4=2

1) x = 3 и -10 по теореме виета
2)  D = 1 + 24 = 25
x= 1 + 5/12 = 0.5
x = -4/12 = -1/3

3) 4x^2 - 4x -3=0
D = 16 + 48 = 64
x = 4 - 8 / 8 = -0.5
x = 12/8 = 1.5

4) D = 1 + 48 = 49
x = 1 - 7/ 4 = 1.5
x = 8/4 = 2

5) D = 16 + 48 = 64
x = -4-8 / 6 = -2
x = 4/6 = 2/3

6) D = 4 + 32 = 36
x = 8/4 = 2
x=-4/4 = -1