exam Maths Puzzle Numerical Ability

two x squared plus 12 x plus k (k is greater than 0) there should be three answers to this questions and i can only figure one answer (18)

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exam Other Question

4) Perform the division:

4x^4 - x^3 - 7x^2 + 18x divided by x - 2

The solution I got was:

4x^3 + 7x^2 + 7x + 4 + 8/x - 2

Is this correct?

Thank you

Christine
The sum of two numbers is 146. Find the two numbers if the larger one is 7 less than twice the smaller