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Factorise: A2 - 23a + 42 - Mathematics

Sum

factorise:  a2 - 23a + 42

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Solution

a2 - 23a + 42  ...[42 = 21 × 2 and 21 + 2 = 23]

= a2 - 21a - 2a + 42

= a(a - 21) - 2(a - 21)

= (a - 21)(a - 2)

Concept: Factorisation by Grouping
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 13 Factorisation
Exercise 13 (F) | Q 4.1 | Page 163
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