Which products result in a difference of squares or a perfect square trinomial? Check all that apply. (5x + 3)(5x – 3)(7x + 4)(7x + 4)(2x + 1)(x + 2)(4x – 6)(x + 8)(x – 9)(x – 9) (–3x – 6)(–3x + 6)

A product of conjugates, (a + b)(a − b), is a difference of squares; multiplying a binomial by itself gives a perfect square trinomial. Choice A uses conjugates, so it gives 25x² − 9. Choices B and E each multiply a binomial by itself, so they give perfect square trinomials. Choice F is also a product of conjugates (with terms −3x and 6), giving 9x² − 36. Choices C and D have neither pattern.

AI-written and checked against the verified answer.