Archive
14th of September 2015
Mathematics
Q:

factorise : x6 -7x3 -8

Nisha_vini29 - CBSE - Class IX

Monday, September 14, 2015 at 00:22:AM

A:

C o n s i d e r space t h e space g i v e n space e x p r e s s i o n space x to the power of 6 minus 7 x cubed minus 8 r e w r i t i n g space t h e space g i v e n space e x p r e s s i o n comma space w e space h a v e comma open parentheses x cubed close parentheses squared minus 7 open parentheses x cubed close parentheses minus 8 L e t space x cubed equals y T h u s comma space t h e space g i v e n space e x p r e s s i o n space w i l l space b e comma y squared minus 7 y minus 8 equals y squared minus 8 y plus y minus 8 equals y open parentheses y minus 8 close parentheses plus 1 open parentheses y minus 8 close parentheses equals open parentheses y plus 1 close parentheses open parentheses y minus 8 close parentheses equals open parentheses space x cubed plus 1 close parentheses open parentheses space x cubed minus 8 close parentheses equals open parentheses x plus 1 close parentheses open parentheses x squared minus x plus 1 close parentheses open parentheses x minus 2 close parentheses open parentheses x squared plus 2 x plus 4 close parentheses equals open parentheses x plus 1 close parentheses open parentheses x minus 2 close parentheses open parentheses x squared minus x plus 1 close parentheses open parentheses x squared plus 2 x plus 4 close parentheses

Monday, September 14, 2015 at 18:02:PM