Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(a+2b-4c)^{2}-$$

Expand

$a^{2}+4ab-8ac+4b^{2}-16bc+16c^{2}$

Evaluate

$\left(a+2b-4c\right)^{2}$

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