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CBSE Class 7 Answered

How to simpify combining like terms-
  1. 3a-2b-ab-(a-b+ab)+3ab+b-a
  2. 5x^2y+5x^2+3yx^2-x^2-y^2+8xy^2-3y^2
  3. t-8tz,3tz-z,z-t
Asked by Shreelakshmi | 10 Mar, 2016, 05:57: PM
answered-by-expert Expert Answer
begin mathsize 16px style 1. space 3 a minus 2 b minus a b minus left parenthesis a minus b plus a b right parenthesis plus 3 a b plus b minus a equals 3 a minus 2 b minus a b minus a plus b minus a b plus 3 a b plus b minus a equals 3 a minus a minus a minus 2 b plus b plus b minus a b minus a b plus 3 a b equals a left parenthesis 3 minus 1 minus 1 right parenthesis plus b left parenthesis negative 2 plus 1 plus 1 right parenthesis plus a b left parenthesis negative 1 minus 1 plus 3 right parenthesis equals a left parenthesis 1 right parenthesis plus b left parenthesis 0 right parenthesis plus a b left parenthesis 1 right parenthesis equals a plus a b 2. space 5 x squared y plus 5 x squared plus 3 y x squared minus x squared minus y squared plus 8 x y squared minus 3 y squared equals 5 x squared y plus 5 x squared plus 3 x squared y minus x squared minus y squared plus 8 x y squared minus 3 y squared equals 5 x squared y plus 3 x squared y plus 5 x squared minus x squared minus y squared minus 3 y squared plus 8 x y squared equals 8 x squared y plus 4 x squared minus 4 y squared plus 8 x y squared F o r space t h i r d space q u e s t i o n comma space i t space i s space n o t space m e n t i o n e d space w h e t h e r space t o space a d d space o r space s u b t r a c t. end style
Answered by Rashmi Khot | 11 Mar, 2016, 12:02: PM

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