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ICSE Class 9 Answered

Help me factorise
 
a^3 -a-120
Asked by tejvarun | 21 Aug, 2016, 09:55: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight a cubed minus straight a minus 120 equals straight a cubed minus straight a minus 125 plus 5 equals straight a cubed minus 125 minus straight a plus 5 equals left parenthesis straight a cubed minus 5 cubed right parenthesis minus left parenthesis straight a minus 5 right parenthesis equals left parenthesis straight a minus 5 right parenthesis left parenthesis straight a squared plus 5 straight a plus 25 right parenthesis minus left parenthesis straight a minus 5 right parenthesis equals left parenthesis straight a minus 5 right parenthesis left parenthesis straight a squared plus 5 straight a plus 25 minus 1 right parenthesis equals left parenthesis straight a minus 5 right parenthesis left parenthesis straight a squared plus 5 straight a plus 24 right parenthesis end style
Answered by Rashmi Khot | 22 Aug, 2016, 11:16: AM

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