Evaluate
4\left(2a-b\right)^{2}
Expand
16a^{2}-16ab+4b^{2}
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1\left(16a^{2}-16ab+4b^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4a-2b\right)^{2}.
16a^{2}-16ab+4b^{2}
Use the distributive property to multiply 1 by 16a^{2}-16ab+4b^{2}.
1\left(16a^{2}-16ab+4b^{2}\right)
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(4a-2b\right)^{2}.
16a^{2}-16ab+4b^{2}
Use the distributive property to multiply 1 by 16a^{2}-16ab+4b^{2}.
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