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\left(7j\right)^{2}-4^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
7^{2}j^{2}-4^{2}
Expand \left(7j\right)^{2}.
49j^{2}-4^{2}
Calculate 7 to the power of 2 and get 49.
49j^{2}-16
Calculate 4 to the power of 2 and get 16.
\left(7j\right)^{2}-4^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
7^{2}j^{2}-4^{2}
Expand \left(7j\right)^{2}.
49j^{2}-4^{2}
Calculate 7 to the power of 2 and get 49.
49j^{2}-16
Calculate 4 to the power of 2 and get 16.