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\frac{x^{2}-3^{2}}{2}
Consider \left(x-3\right)\left(x+3\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{x^{2}-9}{2}
Calculate 3 to the power of 2 and get 9.
\frac{x^{2}-3^{2}}{2}
Consider \left(x-3\right)\left(x+3\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
\frac{x^{2}-9}{2}
Calculate 3 to the power of 2 and get 9.