Question

Factorise each of the following expression
1. -9x²-27x-20
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Answer 1

$- 9 {x}^{2} - 27x - 20$

$= - 1(9 {x}^{2} + 27x + 20)$

$= - 1(9 {x}^{2} + 12x + 15x + 20)$

$= - 1(3x(3x + 4) + 5(3x + 4))$

$= - 1(3x + 4)(3x + 5)$

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