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Use the Direct Method to Evaluate : (Xy+4) (Xy−4) - Mathematics

Sum

Use the direct method to evaluate :
(xy+4) (xy−4)

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Solution

Note: (a+b) (a−b) = a2 − b2

(xy+4) (xy−4) = (xy)2 − (4)2

= x2y2 − 16

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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 12 Identities
Exercise 12 (A) | Q 2.06 | Page 150
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