$(i + 2) (i - 2) = i^{2} - 4$

Explanation

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$(i + 2) (i - 2) \overset{◯}{1} i^{2} - 2 i + 2 i - 4 i^{2} - 2 i + 2 i - 4 \overset{◯}{2} i^{2} - 4$
①	Multiply each term of $(i + 2)$ by each term in $(i - 2)$ . $(i + 2) \cdot (i - 2) = i^{2} - 2 i + 2 i - 4$
②	Combine like terms: $i^{2} - 2 i + 2 i - 4 = i^{2} - 4$

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(i+2)(i−2)=i2−4

$(i + 2) (i - 2) = i^{2} - 4$