Sagot :
[tex]Use \ the \ sum \ and \ difference \ of \ two \ squares \ method; \\ \\ Formula; \\ (x)^{2}-(y)^{2} \\ \\ Let \ x=x \\ Let \ y=3 \\ \\ (x)^{2}-(3)^{2} \to \boxed{ x^{2} -9} \\ \\ Hope \ it \ Helps:) \\ Domini [/tex]