Question

Which will result in a perfect square trinomial?

(3x – 5)(3x – 5)
(3x – 5)(5 – 3x)
(3x – 5)(3x + 5)
(3x – 5)(–3x – 5)

Answer 1

perfect square trinomial is in form
(ax+b)² or (ax+b)(ax+b)
the 2 phrases are identical


answer is obviously the first option

Answer 2

Perfect-square trinomials are of the form:

$a^2x^2 \pm 2axb + b^2$

and are expressed in squared-binomial form as:  $(ax \pm b)^2.$

The only possible choice for squared-binomial form is

$(3x-5)(3x-5)=(3x-5)^2.$

Answer: correct choice is A.