Example

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

Question

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

Expand

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

Evaluate

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

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