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ICSE Class 10 Answered

147 no. 
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Asked by Dev | 20 Apr, 2019, 10:49: AM
answered-by-expert Expert Answer
G i v e n space e q u a t i o n colon y equals a x cubed minus 9 x squared plus 12 x minus 5 equals 0 space h a s space t w o space e q u a l space r o o t s S i n c e space t h e space g i v e n space e q u a t i o n space h a s space r e p e a t y e d space r o o t s comma space s o space w e space h a v e fraction numerator d y over denominator d x end fraction equals 0 rightwards double arrow fraction numerator d y over denominator d x end fraction equals 3 a x squared minus 18 x plus 12 equals 0 S i n c e space i t space h a s space t w o space e q u a l space r o o t s comma space t h e r e f o r e space t h e space d i s c r m i n a n t space i s space greater or equal than space 0 rightwards double arrow left parenthesis negative 18 right parenthesis squared minus 4 left parenthesis 3 a right parenthesis left parenthesis 12 right parenthesis greater or equal than 0 rightwards double arrow 324 minus 144 a greater or equal than 0 rightwards double arrow a less or equal than 2.25 ` H e n c e comma space a equals 2.
Answered by Renu Varma | 20 Apr, 2019, 03:14: PM

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