Question

Решите уравнения)!!!!!!!!!!!!!!!

Answer 1

x² -x -6 =0
D=b² -4ac(a=1,b= -1,c= -1)
D=1 +24=25=5²
x1,x2=(-b+-корень изD)/2a
x1=(1 -5)/2= -2
x2=(1 +5)/2=3

x² +3x =4
x² +3x -4 =0
D=9 +16 =25 =5²
x1=(-3 -5)/2 = -4
x2=(-3 +5)/2 =1

x² =2x +8
x² -2x -8 =0
D=4 +32 =36 =6²
x1=(2 -6)/2 = -2
x2 =(2 +6)/2 =4

x -x/3 =1/2
(3x -x)/3 =1/2
2*2x =1*3
4x =3
x =3/4

x +x/3 =8
(3x +x)/3 =8
4x =8*3
4x=24
x =6

x/2 +x/4 = -3/2
(2x +x)/4= -3/2
2*3x = -3*4
6x= -12
x= -2

3/(x +8) = -7
3= -7(x +8)
3= -7x -56
7x= -56 -3
7x= -59
x= -8 3/7(минус восемь целых три седьмых)