Special Products Rule 2

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Expand $(2a - b)^2$

**Answer**

$\;\;\;(2a - b)^2$

$=(A - B)^2 \text{, where } A = 2a \text{ and } B = b $

$=A^2 - 2AB + B^2$

$=(2a)^2 - 2(2a)(b) + (b)^2 $

$=4a^{2} - 4ab +b^{2} $