How do I factorise this? 9x²-1

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asked Sep 19, 2021 33.0k views

4 votes

How do I factorise this?
9x²-1

Mathematics
high-school

Hitu Bansal asked

by Hitu Bansal

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1 Answer

1 vote

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

Step-by-step 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)

Gurneet Sethi answered Sep 26, 2021

by Gurneet Sethi

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