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Question

Simplify  $${(x-2y)}^{2}-4x+8y$$


Solution

$$\begin{array}{l} { \left( { x-2y } \right) ^{ 2 } }-4x+8y \\ ={ x^{ 2 } }+4{ y^{ 2 } }-4xy-4x+8y \end{array}$$

Mathematics

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