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\left(2b\right)^{2}-1^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
2^{2}b^{2}-1^{2}
Expand \left(2b\right)^{2}.
4b^{2}-1^{2}
Calculate 2 to the power of 2 and get 4.
4b^{2}-1
Calculate 1 to the power of 2 and get 1.
\left(2b\right)^{2}-1^{2}
Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
2^{2}b^{2}-1^{2}
Expand \left(2b\right)^{2}.
4b^{2}-1^{2}
Calculate 2 to the power of 2 and get 4.
4b^{2}-1
Calculate 1 to the power of 2 and get 1.