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What is the value of 2a3 - a, when a = 4?

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In algebra, the 'O' in BODMAS stands for 'Order' and the 'I' in BIDMAS stands for 'Index'.  'Order' and 'Index' mean the same thing. 


What is the value of 2a<sup>3</sup> - a, when a = 4?






 
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