book Maths Puzzle Numerical Ability

Factor the following polynomials 2x^2-2x-12 and 4x^2-12x+9

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Please Help me with this word problem.

Six grapefruit cost as much as a dozen oranges. The cost of a dozen grapefruit and two dozen oranges is $12.00. How much does one grapefruit cost?

Thanks. How do you simplify this in radical form, (square root symbol)10/36