(4-5 times) =3

(5x-4)？ =3

5x-4= √3

5x=4+ √3

x=(4+ √3)/5

(2)

(2x-3)？ =x？

2x-3= x

2x-3=x or 2x-3=-x

that is

X=3 or x= 1

(3)

(x-4)？ - 16-33=0

(x-4)？ =49

x-4= 7

X= 1 1 or x=-3.

(4)

3x？ +5x-4=0

x=(-5 √(5？ +4*3*4))/6

that is

x=(-5 √73)/6

(5)

2x？ -7x-3=0

x=(7 √(7？ +4*2*3))/4

that is

x=(7 √73)/4

(6)

2x？ -√5x+ 1=0

x=(√5 √(5-4*2* 1))/4

that is

x=(√5 √-3)/4

rule

x=(√5 √3i)/4

Note that this is the solution of complex number field.