exam Maths Puzzle Numerical Ability

hi can someone please factor this
9-x^2

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exam Other Question

One carpenter can complete a kitchen in 8 days. With the help of another carpenter, they can do the job toegether in 4 days. How long would it take the second carpenter if he worked alone?

Would you set it up like this?

x/4-x/8=1 If g(x) = 3x - 8, find g[g(-4)].

Thanks