Question

how to FACTORISE X²-9​

Answer 1

Answer:

(x-3) (x+3)

Step-by-step explanation:

x²-9 is a difference of squares

and is general factorise as

a²-b²= (a-b) (a+b)

here,a=x and b=3

x²-9= (x-3) ( x+3).

Answer 2

X^2 - Y^2 =(X-Y) (X+Y)

X^2 - 9 = X^2 - 3^2

=( X+3) (X-3)

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