(a - 2b)² - (5a - 2b) + 6
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Step-by-step explanation:
(a-2b)² - (5a-2b) + 6
= a² - 2 (a) (2b) + (2b)² - 5a - 2b + 6 ∵ (a-b)² = a² - 2ab + b²
= a² - 4ab + 4b² - 5a - 2b + 6
= a² + 4b² - 4ab - 5a - 2b + 6
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