Question

a
$(a - 2b) {}^{2}$
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Answer 1

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$\sf(a-2b){}^{2} \\ \sf\implies\ a{}^{2}+2b{}^{2}-2×a×2b \\ \sf\implies\ a{}^{2}+4b{}^{2}-4ab$

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Answer 2

Answer:

(a-2b)²

(a)²+(2b)²+2*a*2b

a²+4b²+4ab