exam Maths Puzzle Numerical Ability

Find all positive values for k for which each of the following can be factored,



x^2+x-k

???

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Tutor Can you help me in determining whether the function is even, odd or neither even or odd?

f(x)=x-|x|
hey i would really appreciate it if you could solve this combinatorics problem for me:
P(n,3)= 2C(n,2), nϵN.