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CBSE Class 9 Answered

If a/b+b/a=-1 find a^3-b^3
Asked by daskousik2004 | 30 May, 2019, 10:05: AM
answered-by-expert Expert Answer
begin mathsize 16px style straight a over straight b plus space straight b over straight a space equals space minus 1 rightwards double arrow straight a squared space plus space straight b squared space equals space minus ab rightwards double arrow straight a squared space plus space straight b squared space plus space ab space equals space 0 space.... space left parenthesis straight i right parenthesis We space know space that comma straight a cubed minus straight b cubed space equals space left parenthesis straight a space minus space straight b right parenthesis open parentheses straight a squared space plus space ab space plus space straight b squared close parentheses space space space space space space space space space space space equals space left parenthesis straight a space minus space straight b right parenthesis space cross times space 0 space space space space.... space from space left parenthesis straight i right parenthesis space space space space space space space space space space equals space 0 space rightwards double arrow space space straight a cubed minus straight b cubed space space equals space 0 space end style
Answered by Yasmeen Khan | 30 May, 2019, 10:19: AM

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