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x^{2}-4
Multiply and combine like terms.
\left(x-2\right)\left(x+2\right)
Rewrite x^{2}-4 as x^{2}-2^{2}. The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
x^{2}-4
Subtract 8 from 4 to get -4.