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2^{2}-\left(\sqrt{18}\right)^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
4-\left(\sqrt{18}\right)^{2}
Calculate 2 to the power of 2 and get 4.
4-18
The square of \sqrt{18} is 18.
-14
Subtract 18 from 4 to get -14.