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

Sum

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

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Solution

Note: (a+b) (a−b) = a2 − b2

(2+a) (2−a) = (2)2 − (a)2

= 4 − a2

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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (A) | Q 2.02 | Page 150
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