exam Maths Puzzle Numerical Ability

Find all positive values for k for which it can be factored.

x squared + x - k

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exam Other Question
ab^6(a^2-2a-15)
_________________ divided by
a^7b^5(5-a)



Thank you so much!!!!!1 What is the sum of the digits of the decimal form of the product 2^1999 * 5^2001?