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Use the Direct Method to Evaluate : (2a+3) (2a−3) - Mathematics

Sum

Use the direct method to evaluate :
(2a+3) (2a−3)

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Solution

Note: (a+b) (a−b) = a2 − b2

(2a+3) (2a−3) = (2a)2 − (3)2

= 4a2 − 9

Concept: Algebraic Identities
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (A) | Q 2.05 | Page 150
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