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Ex 12.2, 5 - What should be taken away from 3x^2 - 4y^2 + 5xy + 20 to

Ex 12.2, 5 - Chapter 12 Class 7 Algebraic Expressions - Part 2

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Ex 12.2, 5 What should be taken away from 3x2 – 4y2 + 5xy + 20 to obtain – x2 – y2 + 6xy + 20? Given that (3x2 – 4y2 + 5xy + 20) − Expression = (– x2 – y2 + 6xy + 20) (3x2 – 4y2 + 5xy + 20) − (– x2 – y2 + 6xy + 20) = Expression Expression = (3x2 – 4y2 + 5xy + 20) − (−x2 − y2 + 6xy + 20) Putting like terms below like terms & subtracting Answer is 4x2 − 3y2 − xy

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.