4b²-1-2a-a² -factorise
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Step-by-step explanation:
4b² - 1 - 2a-a² = 0
=> a²+2a+1-4b²=0
=>(a+1)² - (2b) ² = 0
=>(a+1)² = (2b) ²
=> a+1=2b
=> a-2b =1
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