Question

x²+19x-20 factorise​

Answer 1

Answer:

your answer

(x-1x+20x)

Step-by-step explanation:

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Answer 2

We have,

$\quad \: {x}^{2} + 19x - 20 \\ \\ = {x}^{2} + (20 - 1)x - 20 \\ \\ = {x}^{2} + 20x - x - 20 \\ \\ = x(x) + 20(x) - 1(x) - 1(20) \\ \\ = x(x + 20) - 1(x + 20) \\ \\ = (x + 20)(x - 1)$
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