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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.