exam Maths Puzzle Numerical Ability

simplify:

(x-5)(x^2-3x-2)

thanks

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exam Other Question

I have 7 similar problems. I just need to know how to compare
8 divided by 89,593=.9%
16,692 divided by 296,410,404=5.6%

How do I compare these two percentages. What b graph of the line through (3, 2) with slope 1/2