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CBSE Class 9 Answered

Find the value of a3 + b3 +6ab -8 when a+b =2 ?
Asked by Vikas | 23 Mar, 2017, 05:46: PM
answered-by-expert Expert Answer

begin mathsize 16px style Given space straight a plus straight b space equals 2 Cubing space on space both space the space sides comma space we space get space left parenthesis straight a plus straight b right parenthesis cubed space equals space 2 cubed space space rightwards double arrow straight a cubed space plus space straight b cubed space plus space 3 ab left parenthesis straight a space plus space straight b right parenthesis space equals space 8 rightwards double arrow space straight a cubed space plus space straight b cubed space space plus space 3 ab left parenthesis 2 right parenthesis space equals space 8 space space space rightwards double arrow straight a cubed space plus space straight b cubed space plus 6 ab space minus 8 space equals space 0 end style

Answered by | 23 Mar, 2017, 06:05: PM

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