Use the Direct Method to Evaluate : (0.5a−2a) (0.5+2a) - Mathematics

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Sum

Use the direct method to evaluate :
(0.5a−2a) (0.5+2a)

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Solution

Note: (a+b) (a−b) = a2 − b2

(0.5a−2a) (0.5+2a)

= (0.5)2 − (2a)2

= 0.25 − 4a2

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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (A) | Q 2.11 | Page 150
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