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left parenthesis, x, plus, 4, right parenthesis, left parenthesis, x, minus, 4, right parenthesis
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x^{2}-4^{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}-16
Calculate 4 to the power of 2 and get 16.
x^{2}-4^{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}-16
Calculate 4 to the power of 2 and get 16.