exam Maths Puzzle Numerical Ability

I need to factor the trinomal
s^3-2s^2-63s
Ok I know I need to foil
(s+9)(s^2-7)?

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exam Other Question

f=ma find f when m=60 a=-0.75 Write each number in the form a/b using integers to show that this a rational number. The numbers are 0.2, 21.3 and -4.