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CBSE Class 9 Answered

2x^2/3-12x/3=28
Asked by poojavinti | 10 Jul, 2019, 09:20: PM
answered-by-expert Expert Answer
begin mathsize 16px style fraction numerator 2 straight x squared over denominator 3 end fraction minus space fraction numerator 12 straight x over denominator 3 end fraction equals space 28 rightwards double arrow 2 straight x squared space minus space 12 straight x space equals space 28 space cross times space 3 rightwards double arrow space straight x squared space minus space 6 straight x space equals space fraction numerator 28 space cross times space 3 over denominator 2 end fraction rightwards double arrow space straight x squared space minus space 6 straight x space equals 42 space rightwards double arrow space straight x squared space minus space 6 straight x space minus 42 equals space 0 Here space straight a space equals space 1 comma space straight b space equals space minus 6 space and space straight c space equals space minus 42. rightwards double arrow space straight x space equals space fraction numerator negative straight b plus-or-minus square root of straight b squared minus 4 ac end root over denominator 2 straight a end fraction equals space fraction numerator begin display style negative open parentheses negative 6 close parentheses plus-or-minus square root of left parenthesis negative 6 right parenthesis squared minus 4 left parenthesis 1 right parenthesis left parenthesis negative 42 right parenthesis end root end style over denominator begin display style 2 cross times 1 end style end fraction equals space 3 plus-or-minus square root of 51 rightwards double arrow space straight x equals space 3 plus square root of 51 space or space space straight x equals space 3 minus square root of 51 end style
Answered by Renu Varma | 11 Jul, 2019, 10:06: AM

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