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CBSE Class 10 Answered

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Asked by gpnkumar0 | 08 Jun, 2017, 05:12: PM
answered-by-expert Expert Answer
begin mathsize 16px style We space observe space that space straight y equals ax squared plus bx plus straight c space represents space straight a space parabola space opening space downwards. therefore space straight a space less than space 0 The space vertex space of space the space parabola space is space in space 2 nd space quadrant. therefore minus fraction numerator straight b over denominator 2 straight a end fraction less than 0 rightwards double arrow negative straight b greater than 0 rightwards double arrow straight b less than 0 Now comma space straight f left parenthesis 0 right parenthesis greater than 0 space as space parabola space cuts space positive space straight Y minus axis. rightwards double arrow straight c greater than 0 Thus comma space we space have space straight a less than 0 comma space straight b less than 0 space and space straight c greater than 0. Hence comma space correct space option space is space left parenthesis straight a right parenthesis. end style
Answered by Rashmi Khot | 09 Jun, 2017, 09:45: AM

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