Factorise [math]x^2 - 9[/math]

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Factorise [math]x^2 – 9[/math]

Difference of Two Squares AlgebraBasics
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This is a difference of two squares:

[math]a^2 – b^2 = (a – b)(a + b)[/math]

Therefore, our answer is [math](x – 3)(x + 3)[/math]

 

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