antonioserika antonioserika

31-12-2020
Mathematics

contestada

how do I factorise this?
9x²-1

Respuesta :

melikaz melikaz

31-12-2020

(3x-1)(3x+1)

Explanation:
Since they are both squared 9x^2 and 1^2
Also there is a “-“
So we use this formula to factorize :
a^2 - b^2 = ( a-b) (a+b)

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