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\left(\sqrt{5}\right)^{2}-2^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
5-2^{2}
The square of \sqrt{5} is 5.
5-4
Calculate 2 to the power of 2 and get 4.
1
Subtract 4 from 5 to get 1.