Use the Direct Method to Evaluate : (3b−1) (3b+1) - Mathematics

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Sum

Use the direct method to evaluate :
(3b−1) (3b+1)

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Solution

Note: (a+b) (a−b) = a2 − b2

(3b−1) (3b+1)

= (3b)2 − (1)2

= 9b2 − 1

Concept: Algebraic Identities
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (A) | Q 2.03 | Page 150
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