Factorise: 1 - 18x - 63x2

factorise: 1 - 18x - 63x²

Sum

1 - 18x - 63x²

= 1 - 21x + 3x - 63x²

= 1 (1 - 21x) + 3x (1 - 21x)

= (1 - 21 x) (1 + 3x)

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Factorisation by Grouping

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Chapter 13: Factorisation - Exercise 13 (F) [Page 163]

Chapter 13 Factorisation
Exercise 13 (F) | Q 4.3 | Page 163

Factorise : 2ab²c - 2a + 3b³c - 3b - 4b²c² + 4c

factorise: 2a² + 7a + 6

factorise: 5 + 7x - 6x²

factorise: (x - 2y)² - 12(x - 2y) + 32

factorise: x²y² - 3xy - 40

factorise: 12(a + b)² - (a+ b) - 35

Factorise the following by grouping the terms:
x(x - 4)- x + 4

Factorise the following by grouping the terms:
3ax² - 5bx² + 9az² + 6ay² - 10by² - 15bz²

Factorise the following by grouping the terms:
2a + b + 3c - d + (2a + b)³ + (2a + b)²(3c - d)

Factorise the following by grouping the terms:

`(1)/(25x^2) + 16x^2 + (8)/(5) - 12x - (3)/(5x)`