Respuesta :

9a^4 - b^2
= (3a^2)^2 - b^2 
= (3a^2 + b)(3a^2 - b) ................using a^2 - b^2 = (a+b)(a-b)

hope it helps


Answer:

(3a^2 + b)(3a^2 - b)

Step-by-step explanation:

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