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CBSE Class 9 Answered

can u plz help me to solve all the questions of exercise 2.1 question no.2&3 from second chapter?plz give me the ans fast...................

 

Asked by Prachi Jha | 13 May, 2014, 07:24: PM
answered-by-expert Expert Answer
G i v e n space e q u a t i o n space i s space f left parenthesis x right parenthesis equals a x squared plus b x plus c L e t space alpha comma beta space a r e space t h e space r o o t s space o f space t h e space e q u a t i o n T h u s comma space t h e space s u m space o f space t h e space r o o t s comma space alpha plus beta equals fraction numerator minus b over denominator a end fraction T h e space p r o d u c t space o f space t h e space r o o t s comma space alpha beta equals c over a W e space n e e d space t o space f i n d comma space alpha minus beta : W e space k n o w space t h a t comma open parentheses alpha minus beta close parentheses squared equals alpha squared plus beta squared minus 2 alpha beta space space space space space space space space space space space space equals alpha squared plus beta squared plus 2 alpha beta minus 4 alpha beta space space space space space space space space space space space space equals open parentheses alpha plus beta close parentheses squared minus 4 alpha beta space space space space space space space space space space space equals open parentheses fraction numerator minus b over denominator a end fraction close parentheses squared minus 4 c over a space space space space space space space space space space equals fraction numerator b squared minus 4 a c over denominator a squared end fraction T h u s comma space alpha minus beta equals plus-or-minus fraction numerator square root of b squared minus 4 a c end root over denominator a end fraction
(ii)
C o n s i d e r space t h e space e x p r e s s i o n : 1 over alpha minus 1 over beta 1 over alpha minus 1 over beta equals fraction numerator beta minus alpha over denominator alpha beta end fraction rightwards double arrow 1 over alpha minus 1 over beta equals minus fraction numerator open parentheses alpha minus beta close parentheses over denominator alpha beta end fraction rightwards double arrow 1 over alpha minus 1 over beta equals minus fraction numerator begin display style fraction numerator square root of b squared minus 4 a c end root over denominator a end fraction end style over denominator begin display style c over a end style end fraction rightwards double arrow 1 over alpha minus 1 over beta equals plus-or-minus fraction numerator square root of b squared minus 4 a c end root over denominator c end fraction
In the same way you can do other problems also.
IF you find difficulty in solving those problems, please ask the queries in expert panel.
Answered by Vimala Ramamurthy | 15 May, 2014, 09:33: AM
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