book Maths Puzzle Numerical Ability

2x cubed - x squared - 18x+9 = 0

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Thank you so much for your help with this. My brain stopped and I need a push. Can you bring me through this problem please...
"Use a quadratic equation to determine the two numbers that satisfy the situation: Their sum is 9 and their product is 20."? determine the constant that should be added to the binomial so that it becomes a perfect square trinomial. factor the trinomial. x^-5x