$(2 - j \cdot 9) \cdot (8 - j \cdot 6) = 54 j^{2} - 84 j + 16$

Explanation

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$(2 - j \cdot 9) \cdot (8 - j \cdot 6) \overset{◯}{1} 16 - 12 j - 72 j + 54 j^{2} \overset{◯}{2} 54 j^{2} - 84 j + 16$
①	Multiply each term of $(2 - 9 j)$ by each term in $(8 - 6 j)$ . $(2 - 9 j) \cdot (8 - 6 j) = 16 - 12 j - 72 j + 54 j^{2}$
②	Combine like terms: $16 - 12 j - 72 j + 54 j^{2} = 54 j^{2} - 84 j + 16$

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(2−j⋅9)⋅(8−j⋅6)=54j2−84j+16

$(2 - j \cdot 9) \cdot (8 - j \cdot 6) = 54 j^{2} - 84 j + 16$