Final answer:
No, x² + 18x + 9 is not a perfect square trinomial.
Step-by-step explanation:
No, x² + 18x + 9 is not a perfect square trinomial.
A perfect square trinomial has the form (a + b)², where a and b are real numbers. To determine if x² + 18x + 9 is a perfect square trinomial, we can compare it to the general form.
x² + 18x + 9 can be factored as (x + 9)(x + 1), which is not in the form (a + b)².
Therefore, x² + 18x + 9 is not a perfect square trinomial.
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