Question

3x +2/x =7, find (9x^2- 4/x^2)

Answer 1

3x+2/x-7=0
3x^2+2-7x=0
3x^2-7x+2=0
3x^2-6x-x+2=0
3x(x-2)-1(x-2)=0
(3x-1)(x-2)=0
3x-1=0
x=1/3.......i
x-2=0
x=2.......ii
putting I
9x^2-4/x^2
9×1/9-4/1/9

1-36
-35

putting ii
9×4-4/4
36-1
35

since when we put i we get answer in negative so it is neglected

hope you understand this