Question

va rog ex 5.Urgent!!!!

Answer 1

a)
(x+3)/(x-1)=9/7
7(x+3)=9(x-1)
7x+21=9x-9
2x=30
x=15

b)
4/x^2 -2 =2/7
2(x^2 -2)=28
x^2 -2=14
x^2 =16
x=+/-4, dar x=N, rezulta x=+4

c)
2/x^3 =1/4
x^3 =8
x=2

d)
2x^2 / (3x^2 +4) =1/2
4x^2 =3x^2 +4
x^2 =4
x=+/-2, dar x=N, rezulta x=+2