ttkemodisa2k ttkemodisa2k

04-06-2019
Mathematics

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Factorise completely 9a^2-1

Respuesta :

AndyBryer AndyBryer

04-06-2019

Answer:

(3a-1)(3a+1)

Step-by-step explanation:

This is the difference of two squares so we can factorise using the rules

x^2-y^2 = (x-y)(x+y)

In this case x = 3a and y = 1 since (3a)^2 = 9a^2 and 1^2 = 1

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