exam Maths Puzzle Numerical Ability

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2(7)+5

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exam Other Question

The profit function for a business is given by the equation P(x)=-4x^2+16x-7, where x is the number sold, in thousands, and P(x) is dollars in thousands. Find the maximum profit and how many items must be sold to achieve it. please can you show me a method of how to work out this equation x^2+9x+14=0