Factorise:
$9 x^{2}-3 x-20$
$9 x^{2}-3 x-20=9 x^{2}-15 x+12 x-20$
$=3 x(3 x-5)+4(3 x-5)$
$=(3 x-5)(3 x+4)$
Hence, factorisation of $9 x^{2}-3 x-20$ is $(3 x-5)(3 x+4)$.
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