exam Maths Puzzle Numerical Ability

Please help me, if you can.
Find the product:
(x - 4y)( 5x - 9y)

Thank you

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exam Other Question

I would like some help in determining all of the real and imaginary zeros of x^4+3x^2-4.

Thank you for your help 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