Which expressions are perfect square trinomials? Check all that apply.x2 + 16x + 8x2 + 14x + 49 x2 – 5x + 25x2 – 24x + 144 x2 + 9x – 81

A perfect square trinomial has the form x² + 2ax + a² = (x + a)². Choice B is x² + 14x + 49 = (x + 7)², and choice D is x² − 24x + 144 = (x − 12)². The other expressions do not have the required matching middle and constant terms.

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