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2^{2}-\left(\sqrt{-9}\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{-9}\right)^{2}
Calculate 2 to the power of 2 and get 4.
4-\left(-9\right)
Calculate \sqrt{-9} to the power of 2 and get -9.
4+9
The opposite of -9 is 9.
13
Add 4 and 9 to get 13.