Answer: (3x-5)(3x-5)
Step-by-step explanation:
A perfect square trinomial is a polynomial that can be expressed in the form of the square of binomial.
Or that is a square root of a binomial.

where 3x - 5 is a bionomial,
⇒ (3x-5)(3x-5) is a perfect square trinomial,

But,
is not a perfect square root of a binomial,
⇒ (3x-5)(5-3x) is not a perfect square trinomial,

But,
is not a perfect square root of a binomial,
⇒ (3x-5)(3x+5) is not a perfect square trinomial,
![(3x-5)(-3x-5)=-(3x-5)(3x+5) = -[(3x)^2-(5)^2]=-9x^2+25](https://tex.z-dn.net/?f=%283x-5%29%28-3x-5%29%3D-%283x-5%29%283x%2B5%29%20%3D%20-%5B%283x%29%5E2-%285%29%5E2%5D%3D-9x%5E2%2B25)
But,
is not a perfect square root of a binomial,
⇒ (3x-5)(-3x-5) is not a perfect square trinomial,