exam Maths Puzzle Numerical Ability

Hpw do i find all positive values for k for which each of the following can be factored.
X^2+X-K

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exam Other Question

T=p(1+r)^t
9 1/2=8000(1+8%)^9 1/2
Will someone please help me solve this problem> factor completly:5x^2+2x-16