Factorise x^2+19 x-20 in the form (x-a)(x+b). - Vidyadip

Question

Factorise $x^2+19 x-20$ in the form $(x-a)(x+b)$.

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Answer

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

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