exam Maths Puzzle Numerical Ability

Can someone please help me I don't understand it....

Directions: Find all positive values for K for which each of the following can be factored.

Problem#1

x^2 + x - k

D

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Please help me with this equation I having some troubling figureing out how to solve it. sqrt{{{(12x^3)/5}}} __ __ __
ac passes through point O, and OB is perpendicular to OD. what is the measure of angle AOD.
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