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CBSE Class 9 Answered

Find the value of x3 + y3 - 12xy + 64 when x + y = 4
Asked by nisha_vini29 | 22 Mar, 2017, 05:53: PM
answered-by-expert Expert Answer

Hi Nisha,

Please check the signs. 

begin mathsize 16px style Given space straight x space plus space straight y space equals 4 Cubing space on space both space the space sides comma space we space get space left parenthesis straight x space plus space straight y right parenthesis cubed space equals space 4 cubed space space rightwards double arrow straight x cubed space plus space straight y cubed space plus space 3 xy left parenthesis straight x space plus space straight y right parenthesis space equals space 64 space rightwards double arrow space straight x cubed space plus space straight y cubed space plus space 3 xy left parenthesis 4 right parenthesis space equals space 64 space space space rightwards double arrow space space straight x cubed space plus space straight y cubed space plus 12 xy space minus space 64 space equals space 0 end style

Answered by | 22 Mar, 2017, 06:09: PM

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