exam Maths Puzzle Numerical Ability

Rewrite the middle term as the sum of two terms and then factor completely. 9x^2 - 12x - 5

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please help I am terrible with geometry.

A customer wants to make a teepee in his backyard for his children. He plans to use lengths of PVC plumbing pipe for the supports on the JOhn does a task in 30 minutes, Jennifer does in 45 minutes and Caryn in 1 1/2 hour. How long would it take for the three of them to do it if they do it together?