book Maths Puzzle Numerical Ability

Find all positive values for k for which the following can be factored.

x^2 + x - k

Thank you!

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book Other Question

I want to know can you help me on this problem:

x2 - x - 20 / x2 + 7x 10
x2 3x - 10 / x2 + 4x - 5 how do u find out the discount of 340.00 and the discount is 75%and the sale price and the sale taxes???