left parenthesis, x, plus, 9, right parenthesis, left parenthesis, x, minus, 9, right parenthesis

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x^{2}-81

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x^{2}-81

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x^{2}-9^{2}

Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.

x^{2}-81

Calculate 9 to the power of 2 and get 81.

x^{2}-9^{2}

Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.

x^{2}-81

Calculate 9 to the power of 2 and get 81.