# Evaluate: (2"A"+1/"2a")(2"A"-1/"2a") - Mathematics

Sum

Evaluate: (2"a"+1/"2a")(2"a"-1/"2a")

#### Solution

(2"a"+1/"2a")(2"a"-1/"2a")

=(2"a")^2-(1/"2a")^2  ......[ ∵ (a − b) (a + b) = a2b2]

=4"a"^2-1/"4a"^2

Concept: Algebraic Identities
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#### APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (D) | Q 2.04 | Page 155