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Factorise: X2 - X - 72 - Mathematics

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Sum

factorise: x2 - x - 72

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Solution

x2 - x - 72

= x2 - 9x + 8x - 72

= x(x - 9) + 8(x - 9)

= (x - 9)(x + 8)

Concept: Factorisation by Grouping
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APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 13 Factorisation
Exercise 13 (D) | Q 8 | Page 161
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