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Select the polynomial that can be factored as (3x + 9)(3x - 9)

A. 9x^2 - 27x - 81

B. 9x^2 + 54x -81

C. 9x^2 - 81

D. 9x^2 - 54x - 81

Thanks!!

Respuesta :

Answer (C): 9x² - 81

Reason:
9x² - 81
= (3x)² - (9)²
= (3x + 9)(3x - 9)

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