Question

x^2 + 19x - 20 factorise this ​

Answer 1

Step-by-step explanation:

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

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