70 cube minus 50 cube minus 20 cube
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=(70)cube -- (50)cube -- (20)cube
(a-b-c)(a2-b2-c2+ab+bc+ac)
Therefore,
=(70-50-20)(70square-50square-20square+70*50+ 50*20+20*70)
=(0)(70square-50square-20square+70*50+ 50*20+20*70)
=0
(a-b-c)(a2-b2-c2+ab+bc+ac)
Therefore,
=(70-50-20)(70square-50square-20square+70*50+ 50*20+20*70)
=(0)(70square-50square-20square+70*50+ 50*20+20*70)
=0
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