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\left(3k\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}.
3^{2}k^{2}-2^{2}
Expand \left(3k\right)^{2}.
9k^{2}-2^{2}
Calculate 3 to the power of 2 and get 9.
9k^{2}-4
Calculate 2 to the power of 2 and get 4.
\left(3k\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}.
3^{2}k^{2}-2^{2}
Expand \left(3k\right)^{2}.
9k^{2}-2^{2}
Calculate 3 to the power of 2 and get 9.
9k^{2}-4
Calculate 2 to the power of 2 and get 4.