. Simplify: (1a + 2b)^2 - ab
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Identity – (a+b)² = a²+2ab+b²
(a + 2b)² - ab
= a² + 2(a)(2b) + (2b)² - ab
= a² + 4ab + 4b² - ab
= a² + 3ab + 4b²
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