Example

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

Question

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

Expand

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

Evaluate

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

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