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Factorise: A2 - 23a -108 - Mathematics

Sum

factorise: a2 - 23a -108 

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Solution

a2 - 23a -108

= a2 - 27a + 4a - 108  ...[27 × 4 = 108 and 27 -4 = 23]

= a(a - 27) + 4(a - 27)

= (a - 27)(a + 4)

Concept: Factorisation by Grouping
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 13 Factorisation
Exercise 13 (F) | Q 4.2 | Page 163
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