a⁴ - 81b⁴ Use suitable identity and express it.
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aditive identity
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Factors of Algebraic expressions
In an algebraic expression, while factoring, terms are formed as products of factors. For example, in the algebraic expression 7xy+3, The term 7xy has been formed by the factors 7, x and y, i.e., 7xy = 7×x×y
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