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CBSE Class 9 Answered

factorise y^3-2y^2-29y-42
Asked by amanansuresh | 18 Sep, 2015, 05:47: AM
answered-by-expert Expert Answer
begin mathsize 14px style y cubed minus 2 y squared minus 29 y minus 42 equals y cubed plus 2 y squared minus 4 y squared minus 29 y minus 42 equals y cubed plus 2 y squared minus left parenthesis 4 y squared plus 29 y plus 42 right parenthesis equals left parenthesis y cubed plus 2 y squared right parenthesis minus left parenthesis 4 y squared plus 8 y plus 21 y plus 42 right parenthesis equals y squared left parenthesis y plus 2 right parenthesis minus left square bracket 4 y left parenthesis y plus 2 right parenthesis plus 21 left parenthesis y plus 2 right parenthesis right square bracket equals y squared left parenthesis y plus 2 right parenthesis minus left parenthesis y plus 2 right parenthesis left parenthesis 4 y plus 21 right parenthesis equals left parenthesis y plus 2 right parenthesis left parenthesis y squared minus 4 y minus 21 right parenthesis equals left parenthesis y plus 2 right parenthesis left parenthesis y squared minus 7 y plus 3 y minus 21 right parenthesis equals left parenthesis y plus 2 right parenthesis left parenthesis y left parenthesis y minus 7 right parenthesis plus 3 left parenthesis y minus 7 right parenthesis right square bracket equals left parenthesis y plus 2 right parenthesis left parenthesis y plus 3 right parenthesis left parenthesis y minus 7 right parenthesis end style
Answered by Rashmi Khot | 18 Sep, 2015, 08:49: AM
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