(a+2b)² - (2a+b)² factorise the following
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Answer:
-3a² + 3b²
Step-by-step explanation:
=> (a²+4b²+4ab) - (4a²+b²+4ab)
=> a²+4b²+4ab-4a²-b²-4ab(``+4ab and -4ab will cancel each other ``)
=> a²+4b²-4a²-b²
=> -3a²+3b²
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