INDICES , SURDS AND SOME IDENTITIES Here there are some formulae and identities which are helpful to students to solve problems in algebra involving indices (powers), surds ( like square roots , cuberoots ) and identities to expand and factorise expressions. IDENTITIES = (a+b)(a-b) [ A very common mistake is to just write the value of (a + b)^2 as (a^2) + (b^2) instead of using the identity given below ] |

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