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RD Chapter 4 Algebraic Identities Ex 4.1 Solutions

Question - 11 : -

Answer - 11 : -


Question - 12 : -

Answer - 12 : -


Question - 13 : - Simplify each of the following products:

Answer - 13 : -


Question - 14 : - Prove that a2 + b2 + c2 – ab – bc – ca is always non-negative for all values of a, b and c.

Answer - 14 : -


∵  The given expression is sum of these squares
∴ Its value is always positive Hence the given expression is always non-¬negative for all values of a, b and c

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