book Maths Puzzle Numerical Ability

please help me with this:

For a value of K, the expression x+k/x^2+kx-15 is undefined when x=5 and x=-3. Find the value of K

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book Other Question

Suppose there is a collection of three or more two dimensional vectors. Provide an argument showing that the collection must be linearly dependent. PlEaSe HeLp =)
In any triangle, the sum of the measures of the angles is 180 degrees. In triangle ABC angle A is four times as large as angle B. angle C measures 0 degrees less than angle B. Find the measures of each angle.

ThAnKiEs!