Factorise: X2 - X - 72

factorise: x² - x - 72

Sum

x² - x - 72

= x2 - 9x + 8x - 72

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

= (x - 9)(x + 8)

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Factorisation by Grouping

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Chapter 13: Factorisation - Exercise 13 (D) [Page 161]

Chapter 13 Factorisation
Exercise 13 (D) | Q 8 | Page 161

Factorise by the grouping method:

ab (x² + 1) + x (a² + b²)

Factorise by the grouping method : a²x² + (ax² + 1) x + a

Factorise by the grouping method : (2a-b)² -10a + 5b

Factorise by the grouping method :
`a^2 + 1/a^2 - 2 - 3a + 3/a`

Factorise : a³ -a² +a -1

Factorise : - x²y - x + 3xy + 3

factorise: (2a + b)² + 5(2a + b) + 6

Factorise the following by grouping the terms:
15x² + 7y - 3x - 35xy

Factorise the following by grouping the terms:
x² - (p + q)x + pq

Factorise the following by grouping the terms:
x + y + m(x + y)