(a - 2b)2 + 6 (a - 2b) + 8
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Step-by-step explanation:
(a-2b)^2+6(a-2b)+8
=a^2-2*a*2b+(2b)^2+6a-12b+8
=a^2+4b^2-4ab+6a-12b+8
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