Example

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

Question

$$( 2 x + y - z ) ^ { 2 }$$

Expand

$4x^{2}+4xy-4xz+y^{2}-2yz+z^{2}$

Evaluate

$\left(2x+y-z\right)^{2}$

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