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CBSE Class 7 Answered

a)What should be added to x^2 +xy+y^2 to obtain 2x^2+3xy?
 
b)What should be substracted from 2a+8b+10 to get -3a+7b+16
Asked by Shreelakshmi | 10 Mar, 2016, 05:47: PM
answered-by-expert Expert Answer
begin mathsize 16px style left parenthesis a right parenthesis space L e t space a space b e space t h e space r e q u i r e d space t e r m. T h e n comma a plus left parenthesis x squared plus x y plus y squared right parenthesis equals 2 x squared plus 3 x y rightwards double arrow a equals 2 x squared plus 3 x y minus left parenthesis x squared plus x y plus y squared right parenthesis rightwards double arrow a equals 2 x squared plus 3 x y minus x squared minus x y minus y squared rightwards double arrow a equals 2 x squared minus x squared plus 3 x y minus x y minus y squared rightwards double arrow a equals x squared plus 2 x y minus y squared left parenthesis b right parenthesis space L e t space p space b e space r e q u i r e d space t e r m. T h e n comma left parenthesis 2 a plus 8 b plus 10 right parenthesis minus p equals negative 3 a plus 7 b plus 16 rightwards double arrow p equals 2 a plus 8 b plus 10 minus left parenthesis negative 3 a plus 7 b plus 16 right parenthesis rightwards double arrow p equals 2 a plus 8 b plus 10 plus 3 a minus 7 b minus 16 rightwards double arrow p equals 2 a plus 3 a plus 8 b minus 7 b plus 10 minus 16 rightwards double arrow p equals 5 a plus b minus 6 end style
Answered by Rashmi Khot | 11 Mar, 2016, 11:46: AM

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