Example

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

Question

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

Expand

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

Evaluate

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

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