a³-9b³+(a+b)³ plz help me to do this
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this is the answer what u asked for question
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Answer:
(a - b ) ( 2a² + 5ab + 8b² )
Step-by-step explanation:
a³-b³+(a+b)³-8b³
=[a³-b³] + [ (a+b)³ - (2b)³ ]
= [ (a-b)(a²+ab+b²) ] + [ (a+b-2b){ (a+b)²+(a+b)2b+(2b)² }
= (a-b)(a²+ab+b²) + (a-b) ( a²+2ab+b² + 2ab + 2b² +4b² )
= (a-b) [ a²+ab+b²+a²+2ab+b²+2ab+2b²+4b² ]
= (a-b) ( 2a²+5ab+8b² )
there you are....
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