simplify : (2a+b) ²-(a+3b) ²-3a²+2ab
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Step-by-step explanation:
(2a+b)² - (a+3b)² - 3a²+2ab
=(4a²+4ab+b²)-(a²+6ab+9b²)-3a²+2ab
=4a²+4ab+b²-a²-6ab-9b²-3a²+2ab
=4a²-a²-3a²+4ab-6ab+2ab+b²-9b²
=4a²-4a²+6ab-6ab+b²-9b²
= -8b²
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