# Use the Direct Method to Evaluate : (3/5"A"+1/2)(3/5"A"-1/2) - Mathematics

Sum

Use the direct method to evaluate :
(3/5"a"+1/2)(3/5"a"-1/2)

#### Solution

Note: (a+b) (a−b) = a2 − b2

(3/5"a"+1/2)(3/5"a"-1/2)

=(3/5 "a")^2-(1/2)^2

=9/25"a"^2-1/4

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#### APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (A) | Q 2.1 | Page 150