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How do you factorise x^2 - 9.
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2 votes
How do you factorise x^2 - 9.

User John Colanduoni
by
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1 Answer

2 votes
x ^ 2 - 9

= x ^ 2 - 3 ^ 2

It turns into 3 ^ 2
Because 3 ^ 2 = 9

The final answer is
= ( x + 3 )( x - 3 )

remember the formula :

a^2 - b^2 =(a+b)(a-b)
User Asaka
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